Danish golfer Thorbjorn Olesen was arrested Monday in London after allegedly sexually assaulting a female passenger on a British Airways flight, according to a report.

Olesen, 29, was busted on suspicion of sexual assault after fellow golf pro Ian Poulter tried to calm down the “slightly intoxicated” golfer while aboard a flight from Nashville to Heathrow Airport after both competed in the WGC-FedEx St. Jude Invitational in Memphis last week, The Sun reports.

Poulter tried to pacify Olesen after he allegedly got verbally abusive with other passengers and flight crew, but Poulter then went to sleep – at which point Olesen allegedly molested the woman. He also urinated in the aisle of the airplane, one witness told The Sun.

“He started abusing some of the passengers and crew and then made a pass at one of the female passengers before taking a leak in the aisle,” the witness recalled. “It was shocking behavior. You would expect it maybe on a budget airline but not in the first-class cabin on [British Airways].”

Olesen, who turned pro in 2008, was later met by Metropolitan Police at Heathrow, where he was arrested on charges of suspicion of sexual assault, being intoxicated aboard an aircraft and failing to comply with the orders of cabin crew, according to the report.

Olesen was later “released under investigation,” police sources said. A rep for the golfer – currently ranked No. 62 on the PGA Tour – did not immediately return a message seeking comment early Thursday.

Olesen finished in 27th place on Sunday. He tweeted that he was looking forward to “some time off” to practice and improve his game.

“Not much to say, other than I’m pretty disappointed with today’s performance!” Olesen wrote.

Poulter’s agent, meanwhile, confirmed that Poulter did his best to settle down a “slightly intoxicated” passenger on the flight before turning in himself.

“He then went to sleep and the first he knew of anything else was when the police were waiting at Heathrow,” agent Paul Dunkley told The Sun.

In a statement to The Post, reps for British Airways said customers and crew deserve to enjoy flights without “any form” of abuse.

“This sort of behavior will not be tolerated, and the appropriate action will always be taken,” the statement read.