The purpose of this study was to verify transference by testing the causal model of parent-child attachment and coach-athlete relationship in sport with the internal working model as the mediator. Data were analyzed by using SEM (Structural Equation Modeling). Participants were 437 seventh- to ninth-grade athletes, with 316 males and 121 females. Results indicated that the internal working model was the single and dominant mediator of the casual model. Parent-child attachment affected the coach-athlete relationship by means of internal working model and the transference existed between coaches and athletes. Finally, recommendations for future research and applications of the results for counseling and coach-athlete relationship were suggested.