This study introduces a dual-ring electronic fence strategy to mitigate interference from Low Earth orbit (LEO) satellites to Geostationary Earth Orbit (GSO) ground stations. The inner ring monitors in real time whether the LEO satellite enters the interference threshold range, while the outer ring facilitates beam switching to maintain stable and reliable communication links. A mathematical model is established to analyze the interference-to-noise ratio (INR), leveraging GSO metrics and the sine theorem to determine the relationship between the electronic fence radius and interference levels. An optimized method is proposed to determine the fence size for effective interference mitigation. Simulation results demonstrate that the dual-ring electronic fence effectively reduces harmful interference from LEO satellites, significantly improving the stability and reliability of communication links. A typical scenario, where GSO and LEO ground stations are co-located, illustrates the approach’s ability to provide sufficient isolation margins, mitigate interference risks, and enhance system reliability. These findings validate the feasibility and practical value of the proposed method for future LEO-GSO satellite coexistence communication networks.