Purpose The purpose of this study was to investigate the effects of sensory integration therapy combined with physical activity according to developmental stage on developmental and visual development of retarded child. Methods A total of 20 sessions of sensory integration program were performed for 9 weeks, three times a week for 40 minutes, 30 minutes for sensory integration therapy and 10 minutes for fine motor activities. Fine motor activity was performed 1 : 1 with the therapist. Preliminary and post-test were performed with the Short Bruininks-Oseretsky test of Motor Proficiency(Short BOT2) and the Korean Development Test of Visual Perception(K-DTVP-2) for the dependent variable measurement. Results The results of the study showed that the scores of the children’s exercise and visual perception were improved. Based on the results of this study, it is expected that sensory integration therapy combined with physical activity according to the developmental stages applied to infants with developmental delay promotes overall development and helps positive development of exercise and visual perception.