The only way is to install a custom device handler in IDE, then remove/reset the IKEA motion sensor and pair it again. It would get the custom device handler instead of the Edge driver. But I would not recommend using groovy device handlers at this point as it will need to be switched back to an Edge driver when ST ends support for groovy.
I use the Zigbee Motion Sensor Mc (Edge driver) from @Mariano_Colmenarejo for my IKEA motion sensor. Give it a try.
once you subscribe to his channel and enroll the Driver, you can select it in the App for the motion sensor.