Given the increasing prevalence of sensory integration dysfunction in preschool children, limited introduction of sensory integration play aids, insufficient user experience, the work aims to explore innovative design methods of sensory integration play aids for preschool children based on multimodal sensory experience, to provide pleasurable multisensory experience for preschool children and lay a solid foundation for their holistic development. Based on multimodal and sensory integration theories, user questionnaires and interviews were employed to create user profiles, identify user requirements, and derive design principles and multimodal interaction processes for sensory integration play aids. By considering preschool children's sensory development, behavioral patterns, and emotional characteristics, the interaction processes and multimodal combination methods were analyzed and a multimodal sensory experience model for these play aids was formulated. The proposed design approach for sensory integration play aids focuses on preschool children's needs and operational preferences, eliminating dual tasks. It emphasizes a primary modality for sensory stimulation, with secondary modalities complementing and enhancing the primary modality information, ensuring smooth transitions between modalities. Moreover, factors such as preferences, emotions, and interests should also be taken into account. Through practical product validation, the user retention test was carried out and the Likert five-point scale and customer callbacks were adopted to collect relevant user data. The efficacy of the multimodal sensory experience-based design method was confirmed, which facilitates the development of preschool children's sensory integration capabilities.