Moving him could cause him to feel nervous and therefore not want to eat. This isn't a hard-and-fast rule...folks have had success at using a separate feeding area, but all in all, I personally find it an unnecessary complication.
Is there a reason why you can't just place the mouse inside the snake's enclosure and then back off? He can then take his time to find it and you don't have to worry about distracting him.
EDIT for one more thought: You can also try pre-scenting the room. Keep the mouse in an enclosure nearby (if it's live) or just lay a thawed or pre-killed mouse on top of his enclosure for about 20 minutes. (You may need to rewarm a thawed mouse just a bit after this period). This trick is VERY good at waking a snake up and getting them into serious hunt-mode which usually leads to a much faster strike when the prey is offered.