diff --git a/.changelog/28792.txt b/.changelog/28792.txt
new file mode 100644
index 000000000000..9195e3adcb24
--- /dev/null
+++ b/.changelog/28792.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_cloudsearch_domain_service_access_policy: Improve refresh to avoid unnecessary diffs in `access_policy`
+```
diff --git a/internal/service/cloudsearch/domain_service_access_policy.go b/internal/service/cloudsearch/domain_service_access_policy.go
index 5fd218b7b335..f330ec63ffbd 100644
--- a/internal/service/cloudsearch/domain_service_access_policy.go
+++ b/internal/service/cloudsearch/domain_service_access_policy.go
@@ -34,10 +34,11 @@ func ResourceDomainServiceAccessPolicy() *schema.Resource {
 
 		Schema: map[string]*schema.Schema{
 			"access_policy": {
-				Type:             schema.TypeString,
-				Required:         true,
-				DiffSuppressFunc: verify.SuppressEquivalentPolicyDiffs,
-				ValidateFunc:     validation.StringIsJSON,
+				Type:                  schema.TypeString,
+				Required:              true,
+				DiffSuppressFunc:      verify.SuppressEquivalentPolicyDiffs,
+				DiffSuppressOnRefresh: true,
+				ValidateFunc:          validation.StringIsJSON,
 				StateFunc: func(v interface{}) string {
 					json, _ := structure.NormalizeJsonString(v)
 					return json