San Diego Academy had its beginnings in 1899 when W. M. Healey, pastor of the Adventist church, rented a store at 17th and K Streets. Seventeen students began their Christian education with Robert Sanders and his wife serving as teachers. The school functioned as an elementary school and then a junior academy until 1930 when it became a full 12-grade school. After a series of moves, the school was located adjacent to the then-church owned Paradise Valley Hospital in 1947. Construction on the new site, just east of the old one, began in 2002. The new facility was completed and classes began in 2800 East 4th Street facility during August 2005.
Academics
The required curriculum includes classes in the following subject areas: Religion, English, Oral Communications, Social Studies, Mathematics, Science, Physical Education, Health, Computer Applications, Fine Arts, and electives. Advanced classes include Honors Chemistry, Honors Physics and AP Calculus AB. The school's musical program includes instrumental and vocal courses such as 5-6 grade band, 7-8 grade band, and high school concert band. The choral program includes a 7-8 grade choir, a high school choir, and a select choral ensemble. Additionally, there is a handbell choir with at least 14 members.
Spiritual aspects
All students take religion classes each year that they are enrolled. These classes cover topics in biblical history and Christian and denominational doctrines. Instructors in other disciplines also begin each class period with prayer or a short devotional thought, many which encourage student input. Weekly, the entire student body gathers together in the auditorium for an hour-long chapel service. Outside the classrooms there is year-round spiritually oriented programming that relies on student involvement.
All students in K-12 are required to take physical education. In the high school level, students are required to play sports or take a PE class until they have two years worth of PE credits. The high school sports program has teams on both the men's and women's junior varsity and varsity level. The varsity program includes men's and women's basketball, men's and women's volleyball, and co-ed soccer. The junior varsity program includes, men's and women's flag football, men's basketball, and men's volleyball. These teams play in the CIF Southern Section, with the exception of flag football, which is played in a league of other Adventist schools. In the junior high level, the sports program includes, boys' flag football, boys' soccer, girls' volleyball, and boys' and girls' basketball.