Communicate between Sipp UAC and UAS via Asterisk

Scenario where sipp server behaves as one of the Asterisk sip station.
Can Sipp server listens as one of the asterisk sip station?

Yes. SIPP allows you to configure multiple interlinked simulations. However that is something you really need to pursue through SIPP support channels.

It is not clear that you even need to interlink the simulations, here.