The streaming service said the ensemble will also include Rhenzy Feliz, Judy Reyes, Gerald Isaac Waters, Taylor Richardson and Anthony Jacques.
They all join the movie's previously announced star, Moana voice actress Auli'i Cravalho.
Director Brett Haley is slated to begin filming the adaptation of Matthew Quick's novel next month.
Haley helmed Hearts Beat Loud and Quick penned Silver Linings Playbook.
"Sorta Like a Rock Star follows a teenage girl who, despite her difficult circumstances, is preternaturally optimistic about the world and her place in it," a press release said. "She often helps those around her, resulting in powerful bonds with a disparate group of outsiders in her community, until she faces a devastating loss and can no longer ignore the challenges in her own life."