The 18-year-old Ethiopian, who is nine months pregnant, is being held in a police cell.
The young divorcee claims that last August, when she was about three months pregnant, she was gang-raped by seven men in the capital, Khartoum.
Sudanese media has tended to undermine the alleged rape victim by falsely claiming that she is a prostitute with HIV.
Moreover, the charge of adultery carries with it the potential sentence of death by stoning if found guilty in Sudan.
The attack was filmed by one of the men on his phone and uploaded on a social media site six months later.
The case went to court earlier this month. Five of the men, between the ages of 18 and 22, are accused of adultery.
By Lee Shin-young, Intern reporter (email@example.com)