You are free to discuss this with a workers comp attorney but in general, workers comp is your sole remedy. (This remains true whether you file a claim or not; I don't know where so many people get the idea that they can forgo filing a claim and sue instead.) The circumstances under which you can file a lawsuit in a workers comp situation are very, very few and far between.
Two things I am tired of typing: 1.) A wrongful termination does not mean that you were fired for something you didn't do; it means that you were fired for a reason prohibited by law. 2.) The above answer, whatever it is, assumes that no legally binding contract or CBA expressly says otherwise. If it does, the terms of the contract apply.