Sanjaya is a fellow member of the Institute of Chartered Accountants of Sri Lanka. He holds a Bachelor of Science Degree in Accountancy & Financial Management from the University of Sri Jayewardenepura and a Masters Degree in Business Administration from the University of Colombo.
Sanjaya is the president of the Institute of Chartered Accountants of Sri Lanka. He is also a Board Member of the Confederation of Asian Pacific Accountants (CAPA), South Asian Federation of Accountants (SAFA) and Sri Lanka Accounting and Auditing Standards Monitoring Board (SLAASMB). Further He is a member of the governing council of the University of Kelaniya (UOK) and the Association of Accounting Technicians of Sri Lanka. Sanjaya is a commissioner of the Securities and Exchange Commission of Sri Lanka (SEC) and a member of the financial system stability consultative committee of Central Bank of Sri Lanka. Sanjaya also serves in the accounting standards committee and auditing standards committee of CA Sri Lanka.
Sanjaya is head of assurance of B.R De Silva & Co, Chartered Accountants (Member firm of Nexia International) and counts over 23 years of experience in practice. He is also a director of Prime land residencies PLC. He was also the Chairman of Mercantile Investments and Finance PLC.