Can I bring my own (BYOL) Microsoft SQL Server licenses for SAP on AWS?

Yes.

Please see theLicensing options for Microsoft Windows Server/ SQL Server-based SAP workloads on AWS (https://aws.amazon.com/blogs/awsforsap/windows-sql-server-licensing-for-sap-on-aws/) blog.

“NOTE: This answer is provided by the SAP on AWS speciality team and is accurate at the time of publish. Please check comments as the answer may have changed/services evolved.“

No simple yes/no answer. There are several scenarios. Please check this blog: https://aws.amazon.com/blogs/awsforsap/windows-sql-server-licensing-for-sap-on-aws/