The coupling-of-modes (COM) model is extensively used in the design of surface acoustic wave(SAW) filters. However, the conventional single-mode COM model is insufficient for accounting for spurious modes, such as higher-order horizontal shear waves and Sezawa waves at the far end. In this study, we first used the single-mode COM model and integrated it with a resonant branch similar to the MBVD equivalent circuit to establish the COM-MBVD model for accommodating the multi-modal acoustic response. Subsequently, an 8th-order ladder structure circuit was constructed for optimization simulation, following this model. The final configuration resulted in a SAW filter with a central frequency of 1 590 MHz, a passband insertion loss below 1.6 dB, an in-band fluctuation of 1 dB, and a bandwidth of 80 MHz (equivalent to a relative bandwidth of 5%). The alignment between the test and simulation data confirms the viability of the design approach.