Stephen
Yes soccer and other football codes often are a good way to reach boys. Many ministries here in Australia provide support and coaching for boys wanting to play these kinds of sports. They are able to share the gospel and invite these kids to youth groups that teach the Bible.
It's wonderful that through such fun events we are able to gather children in and tell them about Jesus.
Our Church has a girls and boys after school clubs that are modelled on Scouts. They do some camping and survival skill training. However as they gather each week to do this they hear a short message from God's Word or about Jesus and learn to sing some Christian songs. Then they do their lesson. They do a couple of camping weekends to practice their skills. Many of these kids have then joined our Church Sunday school or Teen groups studying the Bible.
It's a great way to do outreach amongst kids.