Harry played shortstop at Penn State before being drafted to the MLB after his junior season.
Penn State faced Kansas in a 91-85 home win last season.
Penn State alum Steven Nedorocsik dominated the internet after securing the United States a bronze medal in Olympic men's gymnastics.
The Nittany Lions won't play at home until October 25.
"I want to become a great defender and I think [Penn State] can help me become that."
O'Boyle previously was under contract in Australia.