Purpose The purpose of this study was to assess the feasibility and effectiveness of an augmented reality-based intervention program for people with developmental disabilities. Methods This study was conducted on 12 people with developmental disabilities between the ages of 8 and 20. Cognitive ability evaluation was conducted using Computer Senior Assessment System-Screen, and physical ability evaluation and intervention program were conducted using augmented reality-based rehabilitation device. The combined intervention exercise program consisted of 15 minutes per session, for a total of 2 sets. Results After the application of the augmented reality-based intervention program we observed significant improvements in balance, flexibility, muscle strength, and muscular endurance (p<.05). Conclusion The findings of this pilot study revealed the effectiveness of the augmented reality-based intervention program in physical ability. Therefore, there is a possibility that the augmented reality-based intervention program can be applied to a large population with developmental disabilities.