A teenager charged with attacking a German tourist in Cairns last week has been refused bail.

The 15-year-old boy appeared in Cairns Children's Court this morning accused of assaulting the 20-year-old woman in the grounds of the Cairns State High School sometime between midnight and 1.30am last Tuesday.

She was found with serious head injuries and stripped of some of her clothing.

Pieces of the clothing and blood were allegedly found throughout the school, which was closed and declared a crime scene on Tuesday.

The woman told police last week she did not remember the attack.