The attempted sexual assault at 362 W. El Norte Parkway was reported at 10:10 p.m. Tuesday, according to Escondido police Sgt. Eric Distel.
The man apparently hid in a children's play area inside the gym and attempted to attack the woman while she was alone, Distel said, adding that the woman thwarted the attack but sustained minor cuts and abrasions in the process.
She was taken to Palomar Medical Center to be evaluated, he said.
Police were looking for a heavyset Hispanic man in his 40s with a shaved head and tattoos on his left-hand knuckles. He may also have a tattoo near his left eye, possibly of a tear drop, Distel said.
Police Chief David Nisleit Friday strongly disavowed what he described as an unofficial, "never authorized" departmental program that rewarded officers for making narcotics arrests.
On Friday, San Diego Police announced their search for a suspect involved in a robbery off the San Diego State University campus.
A court-appointed receiver has taken control of a Pacific Beach "hoarder house" that has accumulated trash, created unsafe conditions for children and harbored vermin in recent years, the San Diego City Attorney's Office announced Friday.
The owners of Hauser's Patio reached out to News 8 Friday morning asking to be put in contact with the couple who had their furniture stolen from their patio in Pacific Beach this week.
On Thursday night, the HeartCore Leadership company purchased thousands of dollars worth of Domino's Pizza to feed San Diego's homeless in downtown.
A deadlocked jury prompted a judge to declare a mistrial Friday in the case against a man charged with murder in the 2002 disappearance of his 2-year-old stepson in San Diego.
Federal immigration officers arrested 115 people during a three-day operation in the San Diego area amid heightened tensions between the Trump administration and the state of California over immigration enforcement.