Background: Motor skill development in early childhood is a critical determinant of later physical, cognitive, and social outcomes. Although motor imagery (MI) training is recognized as an effective approach to enhancing motor performance, its application in preschool children has been scarcely investigated. Purpose: To assess the effect of MI training on motor skills in preschool children. Research Design: Randomized controlled trial with three groups: MI group (MIG; n = 16), physical activity group (PAG; n = 15), and control group (CG; n = 15). Study Sample: 46 children (23 females; 23 males; age = 5.4 ± 0.3 years) from the same preschool. Data Collection and/or Analysis: The participants were evaluated at baseline and after the intervention. They all completed the Movement Assessment Battery for Children (M-ABC-2) to assess motor skills. Results: MI training led to significant improvements in manual dexterity, ball skills, and balance compared to the CG and the physical activity group PAG. Conclusions: MI is a promising approach for enhancing motor skill development in preschool settings.