diff --git a/Library/Homebrew/cask/audit.rb b/Library/Homebrew/cask/audit.rb
index ffa47e7394..38c0271e1a 100644
--- a/Library/Homebrew/cask/audit.rb
+++ b/Library/Homebrew/cask/audit.rb
@@ -324,13 +324,18 @@ module Cask
       return if block_url_offline?
 
       odebug "Auditing URL format"
-      if bad_sourceforge_url?
-        add_error "SourceForge URL format incorrect. See #{Formatter.url(SOURCEFORGE_OSDN_REFERENCE_URL)}",
-                  location: cask.url.location
-      elsif bad_osdn_url?
-        add_error "OSDN URL format incorrect. See #{Formatter.url(SOURCEFORGE_OSDN_REFERENCE_URL)}",
-                  location: cask.url.location
-      end
+      return unless bad_sourceforge_url?
+
+      add_error "SourceForge URL format incorrect. See #{Formatter.url(SOURCEFORGE_OSDN_REFERENCE_URL)}",
+                location: cask.url.location
+    end
+
+    def audit_download_url_is_osdn
+      return unless cask.url
+      return if block_url_offline?
+      return unless bad_osdn_url?
+
+      add_error "OSDN download urls are disabled.", location: cask.url.location, strict_only: true
     end
 
     VERIFIED_URL_REFERENCE_URL = "https://docs.brew.sh/Cask-Cookbook#when-url-and-homepage-domains-differ-add-verified"
@@ -895,7 +900,7 @@ module Cask
 
     sig { returns(T::Boolean) }
     def bad_osdn_url?
-      bad_url_format?(/osd/, [%r{\Ahttps?://([^/]+.)?dl\.osdn\.jp/}])
+      domain.match?(%r{^(?:\w+\.)*osdn\.jp(?=/|$)})
     end
 
     # sig { returns(String) }
diff --git a/Library/Homebrew/test/cask/audit_spec.rb b/Library/Homebrew/test/cask/audit_spec.rb
index 72a330e61d..6da7326f7f 100644
--- a/Library/Homebrew/test/cask/audit_spec.rb
+++ b/Library/Homebrew/test/cask/audit_spec.rb
@@ -932,17 +932,21 @@ RSpec.describe Cask::Audit, :cask do
 
         it { is_expected.not_to error_with(message) }
       end
+    end
 
-      context "with incorrect OSDN URL format" do
-        let(:cask_token) { "osdn-incorrect-url-format" }
+    describe "disable OSDN download url" do
+      let(:only) { ["download_url_is_osdn"] }
+      let(:message) { /OSDN download urls are disabled./ }
+      let(:cask_token) { "osdn-urls" }
 
-        it { is_expected.to error_with(message) }
+      context "when --strict is not passed" do
+        it { is_expected.not_to error_with(message) }
       end
 
-      context "with correct OSDN URL format" do
-        let(:cask_token) { "osdn-correct-url-format" }
+      context "when --strict is passed" do
+        let(:strict) { true }
 
-        it { is_expected.not_to error_with(message) }
+        it { is_expected.to error_with(message) }
       end
     end
 
diff --git a/Library/Homebrew/test/support/fixtures/cask/Casks/osdn-incorrect-url-format.rb b/Library/Homebrew/test/support/fixtures/cask/Casks/osdn-incorrect-url-format.rb
deleted file mode 100644
index 10a36d10cc..0000000000
--- a/Library/Homebrew/test/support/fixtures/cask/Casks/osdn-incorrect-url-format.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-cask "osdn-incorrect-url-format" do
-  version "1.2.3"
-
-  url "https://osdn.jp/projects/something/files/Something-1.2.3.dmg/download"
-  homepage "https://osdn.jp/projects/something/"
-end
diff --git a/Library/Homebrew/test/support/fixtures/cask/Casks/osdn-correct-url-format.rb b/Library/Homebrew/test/support/fixtures/cask/Casks/osdn-urls.rb
similarity index 80%
rename from Library/Homebrew/test/support/fixtures/cask/Casks/osdn-correct-url-format.rb
rename to Library/Homebrew/test/support/fixtures/cask/Casks/osdn-urls.rb
index c80bdacf6d..569859db53 100644
--- a/Library/Homebrew/test/support/fixtures/cask/Casks/osdn-correct-url-format.rb
+++ b/Library/Homebrew/test/support/fixtures/cask/Casks/osdn-urls.rb
@@ -1,4 +1,4 @@
-cask "osdn-correct-url-format" do
+cask "osdn-urls" do
   version "1.2.3"
 
   url "https://user.dl.osdn.jp/something/id/Something-1.2.3.dmg"