This paper compared body confidence and self-esteem, according to sex and Sasang constitutions. The group for inquiry is 270 middle schoolboys and schoolgirls. ANOVA and t-test for comparative analysis according to Sasang constitution and sex are performed. Pearson’s Correlation Analysis for correlation between dependent variables is performed. The result of inquiry is as follows. In body confidence according to sex, schoolboys are higher than schoolgirls. In body confidence according to Sasang physical constitution, soyangin is the highest. In the difference of body confidence between schoolboys and schoolgirls according to Sasang constitutions, in case of Soyangin, the body confidence of schoolboys is higher than that of schoolgirls. in case of Taeeumin, the own expression sense of insecurity is high. In the difference of Sasang constitutions according to sex, in case of schoolboys, body own expression of Taeeumin is the highest, in case of schoolgirls, the own expression sense of insecurity, affirmative self, body own expression, of soyangin are the lowest. There is no difference of self-esteem according to sex and Sasang constitutions. Correlation of self-esteem and body confidence according to Sasang physical constitution is different. In conclusion, the difference of body confidence according to sex and Sasang physical constitution, the correlation between self-esteem and Sasang physical constitution are different. Therefore, when we apply it to sport sites, for the improvement of motion accomplishment improvement, coaches and physical education teachers must use different feedback for schoolgirls and soyangin who body confidence is low. Also, if the study of feedback and Sasang physical constitution is performed later, we can apply different training-techniques according to physical constitutions in sport sites.