I think you are misreading the sensor idea. The sensors are tiny thermo devices that change voltage on a certain heatload. They are way smaller than a grain of rice and are usually mounted under or right next to the heat device, like the CPu/NB etc. The temps can be read in the bios or by some aftermarket software.
All mobos have them.
You can buy a fan controller with sensors on tape to play with, but they are not accurate at all.