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In a wireless sensor network, one of the most important constraints on sensor nodes is their power source, which is a battery. Sensor nodes carry a limited and generally irreplaceable battery. When providing a routing protocol for WSNs, it is necessary to take the energy constraint of sensor nodes into consideration. In this paper, a new routing algorithm based on a mobile sink is proposed. In the proposed algorithm, data is forwarded from the sensor nodes to the sink, which moves on four determined paths, by using a virtual cellular structure. In this algorithm when the sink moves from one cell to another, the routing in the network can be updated with minimum energy consumption and delay. The simulation results show that the proposed algorithm is more efficient than similar ones.