Souliere appeared in 85 games over his four years with the Nittany Lions.
The forward will join the Sun Devils for his senior season.
Guðmundsson leaves with three years of eligibility remaining.
The Nittany Lions are set to be joined by Clemson, San Francisco, and Fordham.
Kyle Lehman and TJ Malone each earned weekly awards from the Big Ten on Tuesday.
Penn State was propelled by six runs in the fifth inning in game one, but it wasn't enough as it fell short.