Polymer concrete is a material where a thermoset resin binds together natural or artificial aggregates. This material combines high compressive strength with very high corrosion resistance. However its general mechanical behaviour is brittle. In this work, cork granulates are added to the formulation in order to improve the ductility and reduce weight, taking advantage of its low density and low stiffness, respectively. In addition to these properties cork also exhibits low strength and large compressive strains, which may lead to a more energy-absorbing concrete material. Flexural and compressive tests were performed at room temperature and load vs. displacement curves were plotted up to failure. Both the influence of cork volume fraction and resin/sand weight ratio was considered in the mechanical behaviour. The results anticipate a very interesting expectation in terms of lighter modified polymer concretes with a less brittle compressive behaviour.