We have the kids in Soccer, T-Ball, gymnastics, dance, tumbling, etc...so we stay busy but it's worth all the juggling. One thing you didn't mention is how old your son is. If he's 6 or under then move him to T-Ball. If older then he may feel out of place.
I have found that no kids pay attention in T-Ball, it's the fun part of the game, my girl was the flower picker the first season, the second she learned how to do cartwheels and did then all the time out in the outfield. T-Ball is for little bitty kids, 4 yrs. old to 6 or 7, just learning to hit the ball with a T and to stay in a general area for a few minutes. They don't focus on anything but having fun.
Soccer moves much faster, they are running, back and forth chasing the ball and trying to kick it, it is much more fun for kids that have any kind of attention issue.
I played sports all through my teen years and into college. I got hurt and ended up with knee surgery so I don't get to play anymore. I think the more kids have to do the better they are. It's a balancing act and, of course, I want them to have time for things they like and all but they will play sports too.
If the coach isn't able to work with your son reqest he be moved to a different team, now, before the kids get really bonded with their team mates.