I don't think Clegane lives, but his brother's story is a far more interesting one. As he was dying from the Oberyn's poison, he was given to Quiborn, and I think he resurrected him into Cersei's champion.

Ser Robert Strong is Gregor Clegane, that is common knowledge, however Sandor also lives. Do you remember the quiet isles? The gravedigger that was described had the same features as the hound. The half burnt face, the limp leg, and his frame were all described. Also, the monk said that The Hound was dead, but Sandor Clegane is at peace... Which I think was implying that Sandor's vicious persona, "The Hound" is gone, and that he still lives but is at peace with himself.