An Adelaide man charged over a 20-year-old sexual assault in Perth's southern suburbs has been extradited to face a court in Perth.

Police will allege the then 30-year-old man restrained a woman at a Gosnells house in July, 1994 before taking her to a nearby vacant home and repeatedly sexually assaulting her.

The accused man moved to South Australia more than 15 years ago and was arrested by WA and SA police yesterday.

He was charged with three counts of sexual penetration without consent, one count of indecent assault and one count of deprivation of liberty.

Evidence gathered during the initial investigation was recently examined as part of the Physical Material's Management Project.

The re-examination found new forensic evidence which led to this week's arrest.

Acting Commander Paul Coombes said the man had not been a suspect in 1994 and was not known to the alleged victim.

"The victim in this case has been a fantastic witness, a very strong individual in this case, and obviously she has been dealing with this issue for over 20 years," he said.

The West Australian

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