The reason I ask is because my 4 kids all competed/compete at youth sports at a pretty high level and Sunday play has been a very minor issue for them. My sons both have played Football, Basketball, and Baseball and our Sunday play situations have been very, very few.
For instance in Football the one and only time there has been a Sunday play issue was when I was asked to coach a team that would be playing in an out of state tourney that played on a Sunday, my son of course would have played on that team. We declined to do it for multiple reasons but the main one was because of the Sunday game we would have to play in. But that is it, all of the couple of hundred other football games and practices they've been a part of have never once been on a Sunday, or even asked to be on a Sunday.
Basketball there have been some out of state tourneys that had Sunday play but we just didn't put our team in them and instead elected to put them in tourneys that didn't have Sunday games. There are always tourneys that don't have any Sunday play, even out of state, all you have to do is make the decision to enter your team in those and not the ones that do.
Baseball is the one that has had the most conflicts with Sunday play but even then that is only for out of state tourneys. Here in Utah that is never an issue whether it has been super league teams or All Star teams they just don't schedule Sunday play here since so many won't participate. For out of state stuff we've just made a point of playing in tourneys that aren't held on Sunday's and they are out there, plenty of them actually. Even when they were younger and playing in All Stars we were able to arrange to not have Sunday play. At least two of the times their teams advanced to an out of state regional for Cal Ripken they had it scheduled to play on Sunday but once we informed them we wouldn't play on Sunday they changed them to begin on Monday.