Answer.... YOU DON'T!
This is the code to make the player in an asteroids like game screen wrap and us physics.
[attachment=0:1rau8vq9][/attachment:1rau8vq9]
Do not give the players the wrap behavior. Give the player two instance variables to store the x and y velocity of the physics behavior when they got outside the layout. Disable physics when outside of layout. Reset the x and y depending on witch side of the layout the player left. (compare Players x/y with the layout width/height) then reset both the x and y velocitys and Enable physics.
WA LA! Easy.... not really. Its a mouthful but its not to hard just hard to type out.