This study aims to make a prototype of a sensor-based Smash Athlete volleyball skill test instrument. This research is a type of development research with a model design adapted from Borg & Gall. Validation is carried out by experts who are competent in their fields. In this study, the researchers asked for validation from three experts, namely Evaluation and Measurement Test experts, Volleyball Experts, and Media/IT Experts.20 adult males were enrolled to test this tool. The usage trial was carried out using the expert validity method with an assessment using a questionnaire, test and retest. Data analysis in this study was carried out using the r-correlation method. Based on the expert validation test, the percentage results from Evaluation and Measurement Test experts (96%), Volleyball Experts (92%), Media/IT Experts (94%). The average percentage of all experts is 94%. In the reliability test, the correlation coefficient was 0.999 which was included in the very strong category. So that the Volleyball Smash Test Instrument Design With Sensor Technology is good for measuring volleyball smash skills.