Okay, not really.
But I'm gonna go ahead and just blame the church's hyper-restrictive Sabbath Day observance for the fact that I am not currently an insanely rich soccer superstar, rolling in money and surrounded by beautiful women. Obviously that's not true.
But when I played community intramural soccer as a kid, I was pretty good. Probably not the best on any of the teams, but probably above average. I wasn't really a glory seeker and I wasn't great at shooting, so I took pride in my ability to set up the plays. I considered myself the one who got all the assists instead of the one who got all the goals. I played from the time I was little--about six or seven, up through middle school. And I loved it. But I could only play during the fall season because during the spring season all the games were on Sundays.
Then something horrible happened around eighth or ninth grade--the league changed their schedule so that both spring and fall seasons had games on Sundays. So, being the dutiful Mormon lad that I was (and not that I'd have had much of a choice anyway, because of my parents) I stopped playing the sport that I loved.
The next year, the schedule was inexplicably altered again so that the fall season games were on Sundays but most of the spring season games had moved to Saturdays. I was overjoyed--I could play soccer again! But because of the scheduling weirdness, it had been a year and a half since I'd last played a real game. And when I triumphantly returned to the field, it felt like everybody else had gotten a year and half more skill than I had. Suddenly, I was solidly below average instead of solidly above average. I discovered I did not enjoy the sport nearly as much when I was getting schooled all the time instead of doing the schooling.
As best I remember, I'd quit soccer by my junior year of high school. My year and a half hiatus had ruined my ability to become a superstar.
But I really don't understand the point of "keeping the Sabbath Day holy." It seems to be, at best, a nice sentimental tradition in remembrance (is "in remembrance" used by anybody outside of Mormondom?) of the seventh day of the creation. But it's entirely absurd to make it a doctrinally mandated practice. I came up with a few of the usual reasons for keeping the Mormon Sabbath holy. I'm sure this list is incomplete.
To Demonstrate Obedience - Didn't the whole obedience-for-obedience's-sake thing go out with the end of the Mosaic Law?
To Rest From Your Labors - Sure, taking a break and unwinding is important sometimes. But it's impractical, in the modern world, to expect everyone to take a break on the same day of the week--Sunday, for example. Plenty of jobs require flexible schedules, often necessitating work on Sundays. And besides, as a kid, the day I rested from my labors was Saturday anyway.
To Focus on the Savior - One day a week, you can spend all day being super-religious just to make sure you don't fall out of touch with your religiosity. But I'm going to use the argument my mother made about Easter--you shouldn't need a forced reminder to worship what you believe in if it's really that important to you.
I really don't see what tangible reason there is to keep a kid from playing soccer--or any other healthy activity--on a Sunday.