You can either take two tables and push them together to form a larger, thick rectangle or just have a line running down the middle of the room.
Get one beach ball for every two teams (if you have a large indoor area and large youth group, make more than two teams — no team should be bigger than 10 people)
Have the kids take their shoes off and sit on the floor with their hands under their bottoms. Each team should be on an opposite side of the room. On the floor (if using the line and not tables) use tape to make a large square behind the teams. That is the goal. For those using the tables, the open sides are the goals. Give the kids the beach ball and let them kick it. They can’t use their hands at all to try and kick the ball into the other team goal, nor can they get off their bottoms.
My kids have ALWAYS loved this, and I am begged constantly to play silly soccer. It is an especially good rainy day activity.