LED Shoes - circuit diagram ok?
Will it work? Sort of. You're on the right track.

The issue is the force sensitive resistor (FSR) will probably not go low enough in resistance to have the LED's light up visibly unless you really smash down on it every time Also you will want to have the FSR wired in series with one of the +9v wires like you have it, before the controller.

The solution is have the FSR drive some kind of circuit which can effectively take the "signal" from FSR and use that to switch the power on and off. An easy way would simply be to have the FSR drive a transistor.