You can now use Amazon Simple Queue Service (SQS) with encrypted queues in the AWS GovCloud (US-East) Region. Server-side encryption (SSE) lets you transmit sensitive data in encrypted queues. SSE protects the contents of messages in Amazon SQS queues using keys managed in AWS Key Management Service (AWS KMS). 

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/06/amazon_sqs_server_side_encryption/