SQL agent scheduling for SSIS package

I have a package with a souce and destination connection using login as 'sa'.

I created a scheduling task to call this package for running. However the sql agent service is running as domain user . It required to be running as domain user as per requirement.

Thus when I scheduling the package for execution, it hit error.

Please advise what I can do in order to be able schedule the ssis package?

Thanks in advance.