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As heterogeneous wireless networks are deployed and users need more flexible mobility services, there has been a lot of research work about interworking mechanism between widely deployed 3G network and rapidly boarded WLAN. On the other side, WiBro is newly commercialized in Korea as the next generation wireless network. WiBro is based on IEEE 802.16e and it is expected to provide enough mobility and higher data rate. So the study of the integration between WiBro and cdma 2000 will give better results compared with the existing work of the integration between WLAN and cdma 2000. In order to provide the seamless service across heterogeneous wireless networks, an efficient handoff procedure is essentially required. In this paper, we propose an efficient L2 handoff scheme between cdma 2000 and WiBro networks. The proposed L2 handoff scheme takes an advantage over the existing L3 handoff scheme because it does not require the L3 procedure for the mobility. Through extensive computer simulations with OPNET, the efficiency of the proposed scheme has been validated.