Raindrop splash erosion is influenced by the resistance of soil particles to raindrop impact. This study focused on coarse-grained particles and found that the size of sand particles is the main factor affecting splash rate. The shape and density of particles have minimal impact on splash erosion. The study established a relationship between median sand particle size and splash rate, showing that larger particles are more resistant to raindrop splash. The experimental results matched the theoretical model, confirming the importance of particle size in determining splash erosion.