David Goodman, 25, of Banning, was convicted in February of multiple counts of lewd acts on a child, possession of child pornography and related charges.
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Prosecutors say Goodman, who also volunteered at a children's theater group, intentionally befriended single mothers, calling them "easy targets" in his efforts to gain access to children.
They say when he was 21 he befriended two women in their early 30s who both have children. His victims ranged in age from 5 to 11.
"In a detailed confession letter, the defendant mentioned the best way to gain access to kids was by befriending single mothers who he described as 'easy targets,'" said deputy district attorney Melinda Spencer.
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The prosecutor also said investigators found a manual called "How to Practice Child Love" on Goodman's computer.
At the time of his arrest in December 2014, authorities said Goodman had worked at Disneyland since August of that year.
The case first came to investigators' attention with a report of a then-21-year-old man masturbating in front of two children, ages 6 and 9, at a Yucaipa residence. Further investigation uncovered previous sexual abuse of victims described as boys ages 6 and 9 and a girl, age 5.