Pile foundations often experience lateral loading from a range of structures, such as high-rise buildings, transmission towers, power plants, offshore structures, and highway and railway constructions. The slope on deep foundations loaded in a downward slope direction may reduce the system’s overall lateral capacity. Pile foundations are typically exposed to slopes and are usually used in coastal areas. The behavior of piles on sloping ground under lateral loads differs from that of piles positioned on the level ground surface. Therefore, it is essential to understand better the manner in which sloping ground affects a laterally loaded pile. This paper studies the impact of ground slope, pile diameter, pile-soil interface adhesion, and pile cap on the lateral pile capacity of a pile positioned at the crest of a sandy slope. PLAXIS 3D has been utilized to conduct numerical examinations of a single pile on sloping ground. Sand is modeled as hardening soil material, and pile is modeled as a linear elastic material. An estimation is made for the lateral load capacity of the pile when a specified displacement is given. Lateral pile responses are compared with the level ground case.