Nope. You need to get a Nyko PS3 remote which includes a USB IR receiver that gets plugged into the PS3. Then you can add the Nyko remote to your harmony and control most everything except power - that is still bluetooth only.

The harmony has a database of commands so if your Sirius radio is already in the database then you have the commands available. So it doesn't really "learn" commands for a missing remote - it already has them.