This case study presents an innovative Ethno-STEAM program designed to address the challenges faced by rural schools in Indonesia. Despite the availability of technology, rural schools often lack the resources and expertise to implement effective STEAM education. Hence, this ongoing program aims to create an engaging and effective Ethno-STEAM program for rural students using the Design Thinking (DT) framework while simultaneously preserving endangered cultural heritage, Klenang Sasak. The DT framework applied in this case study consists of empathizing, defining, ideating, prototyping, and testing, which was implemented in three phases: preliminary, main, and final. The initial phase emphasizes developing and validating resources and enhancing teacher capacity, whereas the main phase concentrates on implementing these resources in the classroom. The main phase involved students in the engineering design process, including asking, imagining, creating, testing and evaluating, and communicating, to foster critical thinking, problem-solving, and creativity. The final phase focuses on monitoring, evaluation, and dissemination. The expected output includes developing and validating research-based Ethno-STEAM curriculum materials and preserving cultural heritage by reintroducing the Klenang Sasak instrument. This program demonstrates the potential of Ethno-STEAM to transform rural education, providing a replicable model for rural schools to enhance learning outcomes and preserve cultural heritage.