The only stream recorder I know that can
Record Sirius Radio Online is
Replay A/V, but it is a Windows software application.
But Replay A/V records sound from your sound card when saving Sirius radio online, so you may try any
direct sound recording program for a Mac. You may find some tips about recording Sirius radio online by reading the following FAQ:
Record Sirius Radio Online to the PC with Replay A/V