McCasland takes over for former head coach Tony Benford, who was relived of his coaching duties upon the conclusion of the 2016 season.
Benford was at the end of his five-year contract.
McCasland joins the Mean Green after just one year at Arkansas State University. The Irving native is an 18-year coaching veteran and holds a 219-56 overall coaching record between his time as head coach at Midland College and Midwestern State University. While at Midwestern, McCasland helped the Mustangs reach back-to-back Elite Eights in Division II. During his tenure at Midland, he won a national championship.
In his first and only season at Arkansas State in 2016, McCasland led the Red Wolves to a 20-12 record and a first round exit in the Sun-Belt conference tournament.