This study examines the impact of soil gradation on the correlation between the Dynamic Cone Penetration (DCP) Index and the void ratio of sands from the middle Gujarat region of India. Sand samples were collected from various locations, with poorly graded samples representing the original sands, and well-graded samples created by mixing these original sands in different proportions. Dynamic Cone Penetration Tests (DCPT) were performed on these samples at varying relative densities, while void ratio is calculated from the result of maximum and minimum void ratio determined as per IS 2720 Part-14. The results indicate that the DCP Index decreases exponentially as the void ratio decreases for both poorly and well graded samples. Well-graded sands demonstrated higher maximum and minimum void ratios, along with improved particle packing, compared to poorly graded sands. For poorly graded sands, the relationship between the DCP Index and void ratio was influenced by particle size, whereas for well-graded sands, this relationship was nearly independent of particle size. These findings provide valuable insights into the role of soil gradation in influencing the void ratio and penetration resistance of sand. They hold practical implications for geotechnical applications such as foundation design, road subgrade construction, and evaluating liquefaction risks. The study underscores the importance of considering gradation in predicting soil behavior effectively.