Amenoni Nasilasila was sentenced to eight years in September for the 2018 rape of a young woman.
Last week, the 26-year-old Olympic gold medallist was reportedly seen training with the Namosi rugby teams in Suva.
But women's rights groups say the preferential treatment of high-profile prisoners has to stop.
Shamima Ali, of the Fiji Women's Crisis Centre, said the fact that Nasilasila's non-parole period was six years also highlighted the complete disregard by the department to allow him to participate in training with the Prisons and Namosi rugby teams.
"Barely eight months into his sentence, he can go and play club rugby publicly, and he's glorified by the prisons services and so on," she said.
"Rape is a terrible crime in this country and we have high rates of rape, and they are very hidden. There's a huge conspiracy of silence around rape in Fiji and we believe up to only five percent of cases are reported."
Survey shows scale of domestic and sexual violence
According to a survey carried out by the crisis centre in 2011, 64 percent of women have experienced domestic violence - emotional, physical and sexual.
Sixteen percent of women surveyed also said their first sexual experience was before the age of 15 and it was forced.
"One in three women get raped in Fiji and up to five percent are ever reported," Ali said.
"The youngest child that was raped was four months old with the oldest 90 years old and everyone in between including people with disabilities."
Photo: PHOTOSPORT Caption: Amenoni Nasilasila in action for Fiji on the World Sevens Series.