Keeper wars is a fun competition between two goal keepers who try to score against one another by throwing the ball into the goal.
Create a small field with a large goal and goal keeper at either end.
One of the goal keepers starts with the ball and tries to score by throwing the ball in. The opposite goal keeper tries to save the ball. The keeper who saves the ball is allowed to take three steps from where they saved it before trying the score on the other side.
Other variations of this drill can be done with shots instead of throws or with having each goal keeper be able to shoot from their own half rather than taking three steps.
Emphasize good goal keeping technique. In addition, speed of play can give players an advantage in this drill by taking their shot when their opponent is out of position.