Miami Heat superstar Chris Bosh has been sued by his baby mama — for allegedly torpedoing her deal to join the cast of “Basketball Wives” … AFTER she signed her contract.

Bosh’s ex — Allison Mathis — filed the lawsuit in Orlando, FL last week … in which she claims she signed a deal with show producers which could have scored her more than $250,000 for at least 4 seasons … but Chris screwed it up.

In her suit, Mathis also includes a copy of her contract — which shows she was slated to make $2,500 per episode for the first five shows … and $5,000 for each additional episode.