A patient repositioning apparatus includes a mounting frame configured to couple to an underside of a bed frame. A motor housing is rotatably coupled to the mounting frame for rotation about an axis. The motor housing carries a motor and a winch. The motor is operable to turn the winch. A strap is coupled to the winch and configured to be wound around the winch by the motor. The strap has at least one coupling mechanism configured to couple to a bed sheet.