The player, who has won two England caps during a 13-year career in the top flight, has his tackle exposed in the footage, in which a passer-by is heard asking: “Can I have a go?”
Last night, after the graphic seven-second clip went viral, Castleford fined Westerman and ordered him to carry out community service to educate young people on the effects of alcohol.
Meanwhile, his wife, Lauren, 33, has booted him out of the family home in the West Yorkshire town.
She wrote on Twitter: “Can I make this VERY clear that this is NOT me!!!!!! We have three children, one of whom is almost 15, and she doesn’t need to see things like this all over social media!”
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Distraught mum-of-three Lauren told The Sun she had been sent the video before it was posted online.
She said: "I'm thinking about our children at the moment.
"To be honest none of this has sunk in yet. I'm trying to process what has happened."
The footage was shot at the weekend, days before the start of the Super League season.
A source said 6ft 4in Westerman will miss Castleford’s curtain-raiser against Hull, adding: “He’s effectively been suspended. The video is horrific.”
Teacher Lauren, who married Westerman in 2014, told The Sun she was sent the clip before it appeared online.
In a statement last night Westerman issued an apology to family, friends, the club and to rugby league. He added: “I have realised that I need to work on my decision-making around alcohol.”