It is not possible to remove a Front ABS sensor without destroying it. Before fitting the new sensor measure its diameter with a vernier or micrometer.
Find a suitable drill bit to clean up the hole, finally finishing with a dremel stone bit.
Now check that the new sensor is a tight but sliding fit, that can be pushed in by hand .
Apply copper slip to the area that fits in the hole and provided that you have now made it a sliding fit, you will hopefully be able to remove it in the future.
In reality though, the sensor only needs to be removed if it's faulty.