Adhesive capsulitis (frozen shoulder) is a complex condition characterized by inflammation, fibrosis, and restriction of movement in the shoulder capsule, significantly limiting an individual's participation in daily living activities. It is most commonly observed in individuals aged between 40 and 60 years, and its treatment frequently involves approaches such as manual therapy, exercise, corticosteroid injections, and electrotherapy. However, these conventional methods may be limited by factors such as lack of motivation, pain-related avoidance behavior, and poor treatment adherence. Today, immersive virtual reality technologies introduce a new dimension to rehabilitation by gamifying exercise, providing sensory feedback, and enabling graded exposure through mechanisms such as distraction and engagement. They also enhance motivation and compliance with exercise programs. Studies in the literature have reported that virtual reality-based exercise is an effective method for reducing pain levels in patients diagnosed with frozen shoulder. However, only a limited number of studies have specifically examined the effects of immersive virtual reality in patients with adhesive capsulitis. To date, no study has investigated the impact of immersive virtual reality interventions on sleep and cognitive functions in these patients. Furthermore, the combined effect of patient education, home exercise programs, and immersive virtual reality therapy has not yet been explored. For these reasons, the present study aims to investigate the effects of immersive virtual reality-based exercise therapy on pain, functionality, sleep, and cognitive functions in patients with Grade 1-2 adhesive capsulitis.