The aim of this study was to investigate the effects of core stability training on the Y balance test components in indoor soccer players of Mazandaran University. 24 subjects (age 22.67 yr, weight 70.12 kg, height 1.75 m and BMI 22.70) from Mazandaran University were voluntarily participated and randomly divided into experimental (n=12) and control(n=12) groups. At the onset of the study, the dynamic balance was measured by Y balance test and core stability by some field core stability tests. Experimental group performed the core stability protocol three days per week for six weeks while control group did not perform any training. At the end of the protocol, dynamic balance and core stability were measured again. Independent t test was used to analyze data. The results of Y balance test showed a significant difference in anterior and posterior-interior and no significant difference in posterior-exterior components between the two groups. In addition, significant differences were observed in scores of Sorensen test, trunk flexion, right bridge and hip abduction between the two groups. It can be concluded that core stability training can improve interior and posterior-interior components of Y balance test through strengthening core stability indexes and more training should be applied in posterior-exterior components.