If you are looking to make your circuit simplest, I suggest you to use TWS/RWS434 RF modules. Its not necessary that you should use any driver IC if you are using a single motor. Use any transistor as a switch method and drive the motor using a relay. You can avoid relay also, it will make circuit even simpler, but not a safe method.
Just turn on the transistor module and the data pin of your receiver will go high.
Do you want to turn the motor only in one direction or both?