School Project with Motion Sensor (SEN-13968)

I’m working on a school project where we’re utilizing the motion sensor, but we only want it to sense within a range less than a foot. I believe the info posted about the sensor said it’s minimum distance was about 6 to 8 feet when turned all the way counter-clockwise, but is there a way to further reduce the sensitivity, whether through code (we’re using an Arduino Uno) or through the sensitivity trimpot? If not, is there a different sensor that’s better?

https://www.sparkfun.com/products/12728