This study aims to develop and test the feasibility and effectiveness of the thumb game learning model in improving the basic motor skills of elementary school students. The research material is a development product in the form of a thumb game learning model guidebook designed to train basic locomotor, non-locomotor, and manipulative motor skills in an integrated manner. The research method uses a Research and Development (R&D) approach with an adaptation of the Borg and Gall model which includes the stages of preliminary studies, planning, initial product development, expert validation, small-scale trials, large-scale trials, and effectiveness tests. The research subjects were students of SD Inpres Lelumpang. Data collection techniques used observation, questionnaires, interviews, and basic motor skills tests, while data analysis was carried out descriptively quantitatively and qualitatively. The validation results showed that the product was in the very feasible category, with a feasibility percentage from media experts of 100%, material experts of 90%, and learning practitioners of 94%. The results of the small-scale trial showed that the achievement of basic movements was in the good category with an average percentage of 79%. Furthermore, the results of the effectiveness test in a large-scale trial showed a significant increase in basic motor skills, marked by a total average score on the Post-Test of 30.35 (very good category). In addition, the effect size value (Cohen's d) of 14.63 showed a very large influence on improving students' basic motor skills. The conclusion of this study is that the thumb game learning model is feasible, practical, and effective to be used as an alternative to learning Physical Education, Sports, and Health (PJOK) to improve the basic motor skills of elementary school students.