Investigators said the assault happened on Dec. 22 at Kenneth Hahn Park on La Cienega Boulevard.
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The victim was walking at the park when the suspect sexually assaulted her.
The sheriff's department released a sketch of the man, who's being described as a 5-foot-7 Hispanic man with a medium build and "possible skin discoloration on the right side of his face."
He could be anywhere between 20 to 25 years old. The suspect was last seen wearing a black beanie, a black hoodie and black joggers.
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Anyone with information is urged to call the Los Angeles County Sheriff's Department, Special Victims Bureau toll free tip line at (877) 710-5273 or by email at specialvictimsbureau@lasd.org.