Kaja Sokola, a former model from Poland, testified Thursday at Harvey Weinstein’s retrial in Manhattan, alleging that the disgraced movie mogul sexually assaulted her in 2002 and 2006.

Sokola recounted the alleged 2006 assault, which occurred when she was 19 years old — just days before her 20th birthday. Prior to the alleged incident, Sokola and her older sister met Weinstein for lunch at a restaurant on the ground floor of a Tribeca hotel. Sokola said she wanted to prove to her sister that she knew a “real producer” who could help her acting career.

At one point, Weinstein mentioned he had scripts upstairs in a hotel room, so Sokola took the elevator up with him while her sister remained in the restaurant. When District Attorney Shannon Lucey asked if she had any intention of engaging in anything romantic or sexual with Weinstein in the hotel room, Sokola simply responded, “No.”

When they entered the hotel room,...