Change it to a two team sport, with each team containing 11 players on each side. You could aso have a number of substitutes that you could use if one of the first 11 got tired, got hurt, or if you wanted to change tactics.
Have only one ball and make it much bigger, and instead of walloping the ball with a metal pole, you can use your feet instead, and substitute getting it into a flat hole on the floor, and instead you have to kick it into one of the goals located either end of a pitch. It'll never catch on but sounds much better than the way golf is currently played.