The Wests Tigers centre also lied when interviewed by the NRL's integrity unit, bet on rugby league matches and didn't pass on jersey auction proceeds to charities.
"Based on the evidence we have identified it is very hard to imagine that Tim Simona will be registered with the NRL at any time in the future," NRL chief executive Todd Greenberg said in a statement on Friday.
The NRL has not released specific details of Simona's indiscretions.
But text messages sent by the 25-year-old indicated he knew his behaviour was in breach of the rules, Greenberg said.