Objective : The aim of this study was to investigate the effects of a sensory integration intervention on the sensory processing and posture control of children with developmental delays and a simultaneous family-centered coaching intervention on their parents’ parenting efficacy. Methods : This study adopted a multiple probe design across four children aged five to six with developmental delays and their parents. A sensory integration intervention and a family-centered coaching intervention were employed twice a week in a total of 16 sessions over 8 weeks. Sensory profiles were evaluated, and the Korean version of the Parenting Sense of Competence was used before and after the interventions, and changes in post-intervention posture control were measured using Biorescue equipment. Results : During the intervention period, weight support in the sitting, Sitting with eyes closed, and standing positions evaluated using Biorescue was higher than two standard deviations from the baseline. After the interventions, all children showed enhanced sensory processing. Conclusion : Sensory integration and family centered coaching interventions have positive effects on the sensory processing and posture control of children with developmental delays and on their parents’ parenting efficacy.