A field experiment was carried out in a sandy soil condition of Ismailia Governorate in Egypt (Latitude 30° 35' 30" N, Longitude 32° 14' 50" E) and Elevation 3 meters above sea level, during the winter season of 2020/2021, with an objective to study the interaction of three irrigation levels i.e., 50, 75, and 100% of soil water depletion with four biochar addition rates 0, 1, 2, and 3 kg/m2 on some soil hydro-physical properties such as pore size classes, water holding capacity, field capacity, permanent wilting point and infiltration rate. The results of the mean effect of irrigation rate revealed that using irrigation rate of 100% of water depletion gave, in general, the highest values of water holding capacity, field capacity, permanent wilting point and infiltration rate indices compared to the other treatments. The biochar rate 3 kg/m2 was superior to the other treatments for water holding capacity, field capacity, permanent wilting point, and led to a decrease infiltration rate. The biochar rate 3 kg/m2 and irrigation rate100% were the highest for water holding capacity and field capacity. The interaction between water irrigation rates and biochar treatments was highly significant for all pore size classes. Mean effect of irrigation rate 100 % and biochar 1kg\m2 was highest for quickly drainable pores (QDP) and the ratio of air/water on other treatments. While the biochar rate 3 kg/m2 and irrigation rate of 50 % was highest for slowly drainable pores (SDP), fine capillary pores (FCP), and total drainable pores (TDP). Biochar rate 3 kg/m2 and 100 % of irrigation rate gave the highest water holding pores (WHP) and water storage pores (WSP). Conclusively, it can be concluded that the biochar rate of 3 kg/m2 was superior to the other treatments for water holding capacity, field capacity, permanent wilting point, water holding pores, water storage pores and led to a decrease infiltration rate.