The magazine is reporting that Dingman, an American investor and the son of billionaire Michael Dingman, is an international "playboy" with "girls all over the world."
"Jamie is beyond a huge player," an unidentified "insider" told OK!.
It's not the first time Dingman's alleged trysts have landed him in the spotlight. TMZ reported in July that Dingman had slept with Rachel Uchitel, one of Woods' reported mistresses, though Dingman denied the allegation.
The New York Post first reported that Woods' ex-wife and mom of two was dating Dingman in July. Dingman has been linked in the past to model and actress Bridget Moynahan and Princess Madeleine of Sweden.
Nordregen and Woods officially divorced last year, nine months after Woods' Thanksgiving day car accident that triggered revelations of his extra-marital affairs. Nordegren reportedly received $110 million and joint custody of couple's two children in the divorce settlement.