He did his early education from Islamia Collegiate School. Therefore, after his Matriculation from Islamia Collegiate school, Sadiq joined the Islamia College Peshawar in 1958. Influenced by Abdus Salam and his work, Sadiq studied for his double major in Physics and Mathematics, and learned the Zeeman effect, light interferences using the Pérot and Michelson interferometer. In 1962, Sadiq obtained his BSc in Physics, and a minor in Mathematics. In 1967, Abdullah Sadiq attended Peshawar University where he joined the Physics Department as a graduate student, and taught courses in Mathematics. In 1969, he received his MSc in physics under the supervision of physicist Abdul Majid Mian from the University of Peshawar. His mentor, Abdul Majid Mian refused to recommend him for a job after his college degree and instead advised him to gain a doctorate in physics.