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Sand sampler is necessary for studying sand flow structure and sand movement law. In order to solve the effective separation problem inside sand sampler under the strong wind environment, this paper proposed a diversion gas hedging method. A shunt-hedging sand sampler was designed, and the design principle of diversion gas hedging method and parameters analysis for shunt-hedging sand sampler were described. The wind tunnel experiment and performance analysis on a wind-sand separator were carried out by Fluent software based on numerical simulation. The results showed that the proposed shunt-hedging sand sampler showed a high deceleration and antistrong winds performance. The deceleration magnitude of exhaustport was 88.44%, and the deceleration magnitude of desilting-port was 90%, which ensured the effective separation of wind-sand inside a sand sampler. The average sampling efficiency was 90.15%, and the equal dynamic performance was 93.27%, which was consistent with the basic requirements of designing a sand sampler. It also had low production cost, and could better satisfy the needs of wind tunnel experiments and erosion observation.