While investigating a college student’s claim that she was sexually assaulted by Ben Roethlisberger, Georgia police learned about another woman to whom the star quarterback allegedly exposed himself and became “forceful” with after putting “his hand up [her] skirt,” according to police documents.

A drunk Roethlisberger — who has twice been accused of sexually assaulting women in two other incidents but has never been charged by police — allegedly refused to let a woman leave his house after she drove him home from a party, according to a police report.

The Pittsburgh Steelers QB then allegedly whipped his pants down and told her “she could do whatever she wants,” according to the police report, which doesn’t say when the incident occurred.

A week later, Roethlisberger invited the woman — who is in her early 20s and works at a golf course near his off-season home — to a party at his house.

At the soiree, he invited her to his room, then stuck his hand up her skirt and became angry when she pushed him away, according to the police report.

She “went home and told her father, but her father chose not to pursue the issue,” according to the police.

When cops contacted her, the woman refused to be interviewed because she didn’t want to get dragged into a high-profile case, according to the records of the sex-assault investigation obtained by the Web site The Smoking Gun.

Cops in Milledgeville, Ga., — who were investigating a college student’s allegations that she was sexually assaulted by Roethlisberger in March at a nightclub — learned of the woman from a friend of her family’s. That friend was a member of the Milledgeville Police Department’s Youth Explorer Program.

The new details emerged just days after authorities announced they wouldn’t press charges against Roethlisberger because they couldn’t prove the allegations beyond a reasonable doubt.

Meanwhile, the cop who interviewed Roethlisberger after the alleged March assault has resigned. Sgt. Jerry Blush, who stepped down Wednesday, acknowledged to investigators that he made derogatory comments about the alleged victim to other cops.

Roethlisberger also is being sued by a different woman who claims the two-time Super Bowl champ raped her in 2008 in Lake Tahoe, a charge he denies.

jennifer.fermino@nypost.com