A pandemic is likely to occur in the near future, and it could cause significant disruptions in society creating deaths, despair, fear, and monetary cost, among other losses. Firms would also be negatively affected by a pandemic through loss of revenue, profit, employees, and even through a reduction in the value of the business itself. Especially for service-intensive businesses, employee absenteeism is a key factor that impacts firms when a pandemic occurs, hampering various business operations. In this paper, we describe a system dynamics model that describes dynamics of workforce absenteeism resulting from a pandemic, and also effectiveness of corporate mitigation actions.