The 2019–20 Premier League Tournament Tier B is the second division of the 32nd season of first-class cricket in Sri Lanka's Premier Trophy.

The tournament started on 31 January and was originally scheduled to conclude on 11 April 2020.

[1] Lankan Cricket Club won the tournament in the previous season and were promoted to Tier A.

[3] The league was expanded to twelve teams, with the addition of Kandy Customs Cricket Club, Nugegoda Sports and Welfare Club and Sebastianites Cricket and Athletic Club.

[3] On 16 March 2020, Sri Lanka Cricket postponed the rest of the tournament due to the COVID-19 pandemic.