The 32-year-old has been plagued with rumours about his private life for years, but is set to finally set the record straight during a tense interrogation session during the launch episode.
In 2018, Sam was embroiled in a sexting scandal which involved a Melbourne woman who claimed he had cheated on his wife the year prior.
Confession: Retired NRL star Sam Burgess will admit to cheating on his wife of four-years, Phoebe Burgess, on Monday night's SAS Australia
And in scenes set to air on Monday night, Sam is set to come clean about what happened as he discusses the end of his marriage.
In a trailer for the new season, Sam was seen saying: 'The last 18 months I felt like a loser, my marriage broke down.
'I had just retired from sport, my ex father in law had taken out an AVO against me, and whether you like it or not, losing can become a habit, so I’m here because I want to show myself I can still be a winner.'
Sam and Phoebe, 32, ended their marriage shortly after Christmas in 2018, just three months after the South Sydney Rabbitohs star was cleared of any involvement in an NRL 'sexting' affair.