Answer
Yes. Place the fan at the back of the boat, facing away from the boat.
Work Step by Step
Placing the fan at the back of the boat, facing away from the boat, the fan will be removing particles of air from the system at some speed.
The remaining system (boat without the expelled air) will have momentum equal to the momentum of the air that was expelled, meaning that the boat will have speed in the opposite direction (the boat moves forward).