The man, 54-year-old Michael Dickens, faces charges related to arranging to meet with a minor to engage in sex and distributing pornographic material to a child.
The sheriff's office says Dickens unknowingly contacted an undercover detective from the Central California Internet Crimes Against Children (ICAC) Task Force who was posing as a 12-year-old girl.
Dickens is a parent actively involved with girls' water polo clubs in Clovis and Fresno, the sheriff's office says. He has also been a coach of a girls' softball team in Clovis.
Because of that, detectives believe there are other children who may have had inappropriate interactions with Dickens in the past.
If you think you have information about any other such children, please contact Lieutenant Brandon Pursell at (559) 600-8029 or Valley Crime Stoppers at (559) 498-7867.
He has been booked into the Fresno County Jail.