A man allegedly held a woman at knifepoint before sexually assaulting her in her Footscray home while he was on bail.

Police arrested 35-year-old Takavaha Leveni, of no fixed address, at a property on Flemington Road about 2pm on Wednesday.

The man allegedly forced his way into the victim's home on February 28 and confronted her with a knife about 6am.

He then allegedly sexually assaulted her before running away.

He was charged with sexual assault, aggravated burglary, false imprisonment, assault with a weapon, theft and offences against the bail act.