Time synchronization in Wireless Sensor Networks (WSN) is necessary because time plays a crucial role for many WSN applications. So, a lot of time synchronization schemes for WSN have been proposed. In this paper, a new time synchronization scheme for WSN is developed, which is energy efficient by reducing communication overhead and has good performance in synchronization accuracy and scalability. The proposed synchronization protocol called Indirect-Broadcast Synchronization (IBS) synchronizes a multi-hop network on a cluster basis with the global time from the referenced node. The simulation test result shows that proposed scheme has better energy efficiency and accuracy than existing protocols.