diff --git a/CHANGELOG.md b/CHANGELOG.md
index 914c6bc5bd..593166ddca 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## master (unreleased)
 
+### Changes
+
+* [#409](https://github.com/rubocop-hq/rubocop-rails/pull/409): Deconstruct "table.column" in `Rails/WhereNot`. ([@mobilutz][])
+
 ## 2.9.1 (2020-12-16)
 
 ### Bug fixes
diff --git a/docs/modules/ROOT/pages/cops_rails.adoc b/docs/modules/ROOT/pages/cops_rails.adoc
index 5426eb6d81..bed5d99415 100644
--- a/docs/modules/ROOT/pages/cops_rails.adoc
+++ b/docs/modules/ROOT/pages/cops_rails.adoc
@@ -4554,11 +4554,13 @@ User.where('name <> :name', name: 'Gabe')
 User.where('name IS NOT NULL')
 User.where('name NOT IN (?)', ['john', 'jane'])
 User.where('name NOT IN (:names)', names: ['john', 'jane'])
+User.where('users.name != :name', name: 'Gabe')
 
 # good
 User.where.not(name: 'Gabe')
 User.where.not(name: nil)
 User.where.not(name: ['john', 'jane'])
+User.where.not(users: { name: 'Gabe' })
 ----
 
 === References
diff --git a/lib/rubocop/cop/rails/where_not.rb b/lib/rubocop/cop/rails/where_not.rb
index 998618bed2..f50f4c01a4 100644
--- a/lib/rubocop/cop/rails/where_not.rb
+++ b/lib/rubocop/cop/rails/where_not.rb
@@ -15,11 +15,13 @@ module Rails
       #   User.where('name IS NOT NULL')
       #   User.where('name NOT IN (?)', ['john', 'jane'])
       #   User.where('name NOT IN (:names)', names: ['john', 'jane'])
+      #   User.where('users.name != :name', name: 'Gabe')
       #
       #   # good
       #   User.where.not(name: 'Gabe')
       #   User.where.not(name: nil)
       #   User.where.not(name: ['john', 'jane'])
+      #   User.where.not(users: { name: 'Gabe' })
       #
       class WhereNot < Base
         include RangeHelp
@@ -86,7 +88,9 @@ def extract_column_and_value(template_node, value_node)
 
         def build_good_method(column, value)
           if column.include?('.')
-            "where.not('#{column}' => #{value})"
+            table, column = column.split('.')
+
+            "where.not(#{table}: { #{column}: #{value} })"
           else
             "where.not(#{column}: #{value})"
           end
diff --git a/spec/rubocop/cop/rails/where_not_spec.rb b/spec/rubocop/cop/rails/where_not_spec.rb
index 14ebc45f73..bcaa67151e 100644
--- a/spec/rubocop/cop/rails/where_not_spec.rb
+++ b/spec/rubocop/cop/rails/where_not_spec.rb
@@ -83,22 +83,22 @@
   it 'registers an offense and corrects when using `!=` and namespaced columns' do
     expect_offense(<<~RUBY)
       Course.where('enrollments.student_id != ?', student.id)
-             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use `where.not('enrollments.student_id' => student.id)` instead of manually constructing negated SQL in `where`.
+             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use `where.not(enrollments: { student_id: student.id })` instead of manually constructing negated SQL in `where`.
     RUBY
 
     expect_correction(<<~RUBY)
-      Course.where.not('enrollments.student_id' => student.id)
+      Course.where.not(enrollments: { student_id: student.id })
     RUBY
   end
 
   it 'registers an offense and corrects when using `<>` and namespaced columns' do
     expect_offense(<<~RUBY)
       Course.where('enrollments.student_id <> ?', student.id)
-             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use `where.not('enrollments.student_id' => student.id)` instead of manually constructing negated SQL in `where`.
+             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use `where.not(enrollments: { student_id: student.id })` instead of manually constructing negated SQL in `where`.
     RUBY
 
     expect_correction(<<~RUBY)
-      Course.where.not('enrollments.student_id' => student.id)
+      Course.where.not(enrollments: { student_id: student.id })
     RUBY
   end
 
@@ -183,22 +183,22 @@
     it 'registers an offense and corrects when using `!=` and namespaced columns' do
       expect_offense(<<~RUBY)
         Course.where(['enrollments.student_id != ?', student.id])
-               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use `where.not('enrollments.student_id' => student.id)` instead of manually constructing negated SQL in `where`.
+               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use `where.not(enrollments: { student_id: student.id })` instead of manually constructing negated SQL in `where`.
       RUBY
 
       expect_correction(<<~RUBY)
-        Course.where.not('enrollments.student_id' => student.id)
+        Course.where.not(enrollments: { student_id: student.id })
       RUBY
     end
 
     it 'registers an offense and corrects when using `<>` and namespaced columns' do
       expect_offense(<<~RUBY)
         Course.where(['enrollments.student_id <> ?', student.id])
-               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use `where.not('enrollments.student_id' => student.id)` instead of manually constructing negated SQL in `where`.
+               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Use `where.not(enrollments: { student_id: student.id })` instead of manually constructing negated SQL in `where`.
       RUBY
 
       expect_correction(<<~RUBY)
-        Course.where.not('enrollments.student_id' => student.id)
+        Course.where.not(enrollments: { student_id: student.id })
       RUBY
     end
   end