Almost every PVR or DVD & Hard drive recorder will have the ability to record from an external source.
So, all you would need to do is run a scart (for example) from your satellite box to the recorder (probably AV2)
But, like mentioned above, you will need to leave the satellite box on the correct channel if it's a timed recording.
Also, this thread should probably be in the Home Cinema & Hi Fi section should it not?