Sensored brushless motors are not able to be reversed using a standard ESC. This is because the sensor feedback needs to be in sync with the motor rotation in order for it to work properly. If you were to reverse the motor without changing the sensor feedback, then the ESC would get confused and the motor would not run correctly.
The only way to reverse a sensored brushless motor is by using a special ESC that is designed for reversing brushless motors. These ESCs are not very common, so you may have difficulty finding one. If you do manage to find one, then you will need to follow the instructions that come with it in order to properly reverse your sensored brushless motor.