Sandhu came to Canada as an international student and pursued his studies in Ontario. As a student in Canada, he founded the International Students’ Federation. After graduation, he worked as a computer engineer and a network analyst. Later, he worked as a realtor in the community of Brampton before eventually being elected as a MPP.

Amarjot pursued his education graduating from George Brown College with a post-graduate in wireless networking program. While pursuing his education Amarjot had to work multiple jobs on the side such as, driving a truck and working in a factory. Upon completing his education Amarjot worked as a computer engineer, a network analyst, and a realtor for Royal Lepage, before finally being elected as a Member of Provincial Parliament.

Amarjot Sandhu is currently the Chair of the Standing Committee on Finance and Economic Affairs. In this role, he oversees the committee and has had the privilege of hearing from businesses across the province and what the provincial government can do to support them. He has been sitting as the Member of Provincial Parliament since winning his seat in the 2018 Ontario Provincial Election.

Sandhu is also a Member of the Standing Committee on General Government. Amarjot Sandhu was appointed by Ontario's Premier Doug Ford to serve as the parliamentary assistant to the Minister of Infrastructure Kinga Surma.

Sandhu served as a member of the Standing Committee on Regulations and Private Bills from July 26, 2018 - October 28, 2019. Amarjot also served as Chair of the Standing Committee on Finance and Economic Affairs from October 28, 2019 - October 20, 2021. He is currently serving as a member of both the Standing Committee on Public Accounts and Standing Committee on General Government. On July 9, 2021, Amarjot Sandhu began serving as the parliamentary assistant to the Minister of Infrastructure. In June 2019, after talking to constituents Amarjot tabled a motion to resume the environmental assessment of Highway 413. Highway 413 would be a 60 kilometre freeway connecting Milton from Highway 401 to Highway 400 in Vaughn. The previous Liberal government cancelled the proposal. During his time as the chair of the Standing Committee of Finance and Economic Affairs Amarjot met with many constituents and stake holders during the COVID-19 pandemic to better understand the economic and financial impacts that COVID-19 had on businesses and residents throughout the province. Amarjot chaired the Standing Committee of Finance and Economic Affairs to break the record for the number of hours spent in committee meetings. This committee spent hundreds of hours in session virtually.

Sandhu won re-election to the 43rd Parliament of Ontario. He received 48% of the vote. Sandhu resumed his parliamentary duties following his election. He is currently serving as a member of the Standing Committee on Procedure and House Affairs, and Standing Committee on Government Agencies. He is also continuing his role as the parliamentary assistant to the Minister of Infrastructure.

• Ontario Legislative Assembly parliamentary history