"There was nothing that took place in that hotel room which in any way could be construed as consensual," the woman's personal attorney, Jeffrey Shapiro, said. "This woman was absolutely the victim of a physical and sexual assault."
ABC News does not identify alleged victims of sexual assault.
Strauss-Kahn heads the International Monetary Fund, the organization that oversees the global financial system, and was considered a leading contender to become president of France.
He was arrested Saturday, hauled out of the first-class cabin on an Air France jet moments before taking off from Kennedy Airport.
A friend of the alleged victim described the woman, a mother of a 15-year-old girl, as a "good Muslim" and "not the kind of woman to attack a man."
"This is one of the most important persons in the world. How can he do this?" he said, adding, "she trusts American justice."
ABC News' Lauren Pearle contributed to this report.