Andrews, who taught history at Lorbeer Middle School, is facing a maximum of 15 years and eight months in state prison, according to the District Attorney's Office.
In March, Andrews, of Anaheim, was found guilty of six counts of unlawful sexual intercourse with a minor, five counts of sexual penetration by a foreign object, three counts of lewd act upon a child, two counts of oral copulation of a person under 16 and one count of possession or control of child pornography.
Andrews taught the 13-year-old girl for about a year before the sexual misconduct began, according to a prosecutor.
Some of the incidents occurred at the school, while later incidents occurred off campus, according to the District Attorney's Office.
Andrews was arrested Sept. 30, 2011.—City News Service contributed to this report.