A method and apparatus for performing load re-balancing for the dedicated core network in a wireless communication system is provided. An evolved NodeB (eNB) which supports a dedicated core network receives a mobility management entity group identity (MMEGI) of an MME pool, corresponding to the dedicated core network, from a UE which is attached to a first MME of the MME pool. The eNB redirects the UE to a second MME of the MME pool by using the MMEGI of the MME pool.