Adolescent and young adult cancer survivors (AYACS) are at risk for the development of insomnia, though it remains vastly undertreated. Limited research has evaluated cognitive-behavioral treatment for insomnia (CBT-I) in AYACS. The present study piloted adapted CBT-I designed to improve treatment accessibility by delivering a three-session intervention in person and via videoconference. AYACS with insomnia (N = 12) enrolled in the study. Ten AYACS completed the intervention, with six in person and four via videoconference. Sleep variables improved immediately postintervention and were sustained at two-month follow-up. Within sample effect sizes of the adapted intervention for sleep, variables were large, and there were no noted differences on sleep outcomes between the in-person and videoconference participants. These pilot findings indicate that an adapted CBT-I intervention is feasible and promising in AYACS populations.