You will need to move a parent display group. There is a demo floating around which shows how to do this: It used to be called Ghosts and Monsters and is a demo of how to build an Angry Birds clone.
Basically, because the physics origin is always 0,0 if you move the display group which contains ALL physics bodies (usually you would NEVER move a display group containing physics bodies because it causes the display objects to be out of alignment from their physical bodies) the view of the screen content will shift but the bodies will still interact properly because they are still relative to each other.