Waking ESP8266 from Deep Sleep Using a Motion Detector
You can simply use an N-MOSFET like suggested in the comment.  Connect the MOSFET drain to the wake-up pin of the MCU and the source to the ground. Finally connect the gate of the MOSFET to the motion sensor output signal.
Just make sure the MOSFET you chose has a low enough Vth (Vgs voltage at witch the transistor starts to turn on) to make sure it will pull the CHPD low when the motion sensor drive its gate.