A source close to Nordegren told the Web site on Wednesday that a "divorce is 100 percent on."
Nordegren was recently photographed pumping gas without her wedding ring.
Woods and his wife have been married for five years and have a 2-year-old daughter and a 10-month-old son.
Woods announced late last week he was taking an indefinite leave from public life and golf while he works to fix his marriage after multiple allegations of infidelity.
The announcement came two weeks after Woods crashed his SUV into a tree outside his Florida home, setting in motion a stunning downfall for the world's No. 1 player, who for 13 years rarely made news off the golf course. One woman who said she had a 31-month affair with Woods shared a voice mail that she said Woods left her two nights before his Nov. 27 accident.
"I am deeply aware of the disappointment and hurt that my infidelity has caused to so many people, most of all my wife and children," Woods said in a statement released last week. "I want to say again to everyone that I am profoundly sorry and that I ask forgiveness. It may not be possible to repair the damage I've done, but I want to do my best to try."
Woods has not been seen in public since the accident.
Information from The Associated Press was used in this report.