Non-contact sensing using radar technologies is a prospective technology in combating pandemic diseases such as the COVID-19. Current literature shows the capability of radar for cardiopulmonary signs detection and for securing social distancing, i.e. to count the number of people in a confined place. Nonetheless, the ability of radar ating frequency, and environments. Besides the different radar approaches and signal processing for reliable sensing, many new challenges for practical applications arise. In this paper, we review the state-of-the-art related applications and challenges of radar for combating the pandemic disease. Additionally, as a departure from the conventional approach, radar technique requires some basic explanation. This paper also provides an overview of radar sensing including its physical sensing basis.