Sawa began his career in 1992 as a children's action toy spokesman. He appeared in the film Little Giants and then got his big break in Casper, playing the role of Casper as a human boy. In "Now and Then" Sawa played Scott Wormer the town bully, and shared a second on-screen kiss with his co-star Christina Ricci (the first was in Casper). Sawa also starred in Wild America, Idle Hands, SLC Punk! and Final Destination. In 2000, Sawa played the title character of the Eminem music video "Stan". Sawa later became a voice actor by voicing Flash Thompson in Spider-Man: The New Animated Series. Sawa continued steadily in recent years by appearing in several independent films including Extreme Dating, Shooting Gallery, Devil's Den, Creature Of Darkness, Endure, 388 Arletta Avenue, The Philly Kid, and A Resurrection.