This is an exceptionally small field (at most schools you'll find one sports law class tops) and there's no "ranking" like you would find in US News. However Top Law Schools has complied a list of some schools with larger course offerings.
I would add that going to school for the sole purpose of practicing sports & entertainment law is a very bad idea. There are very, very few jobs in this field - most sports teams, for example, use several different firms for different legal needs like contracts, labor, immigration, etc. A "sports law" specialization won't prepare you for all these needs. If you won't be happy in a legal job that's more accessible, don't bother.
Newly minted layers have no business working for themselves. They need a job with a firm because law school doesn't prepare you for practicing law. Law firms aren't hiring. They're downsizing. Large firms are outsourcing work to India as are major US corporation.
They were misled. They also went into law with their eyes wide shut. There's a glut of lawyers in this country and there has been for decades. Anyone who goes into law school thinking it's the path to a lucretive career hasn't been paying attention.