I've looked on LinkedIn — I'm not limiting myself to sports work — and haven't seen much out there. I must not be looking hard enough.
At first I just got ads for the city I am in. But when those started getting traction, I started seeing tons and tons.
I applied to a few through the quick apply feature (super easy, you usually just download your resume and then answer a few questions from the company). There wasn't a lot of risk and I thought, why not. It will tell you if the application got looked at and if the resume was downloaded. That happened more often than not. Maybe that set off their algorithm?
Regardless, there are a bunch out there. I almost get too many a day. There is likely a filter somewhere to get more of what you are looking for.
Also, now that I am doing what I am doing now, I find LinkedIn to be a fascinating tool. Maybe it is the B2B element, but I am on it almost every day. If I wanted something more, I no doubt think it will help me find it through connections, my own work or something else.