Below is a link to the manual that shows all the operations for this stereo, unfortunately we do not know if it can have XM radio. The manual does not have an operation for that feature. I will contact the manufacturer and find out and will let you know asap.
According to the manufacturer, No, you would not be able to use Sirius with the AWM968. You could use their Onyx tuner and plug into the auxiliary input on the front of the unit, but there is not a Sirius port on the unit.