Children with Autism Spectrum Disorder (ASD) often face significant challenges in social communication, sensory integration, and engagement with traditional therapeutic methods. While Socially Assistive Robotics (SAR) has shown promise, existing platforms are constrained by proprietary designs, limited sensing adaptability, and prohibitive costs (>8,000 $). In this work, we present ROLLY, a software-controlled multi-sensor robotic platform for play-based ASD interventions. Integrating tactile sensors, visual (camera), auditory (sound speaker), and LED-based stimuli systems within a modular chassis. ROLLY enables fully customizable and programmable interactions with a low material cost of $300. The software-defined architecture supports block programming, randomized behavior generation, and manual control via WiFi and USB connectivity. This paper details the system’s design architecture, interaction modalities, and therapeutic applications. By reducing the robot system cost by two orders of magnitude compared to current social robot solutions, ROLLY democratizes SAR research, as well as state-of-the-art robot-based ASD intervention techniques.