This study aims to develop a multi-sector and multilateral model of balance-of-payments constrained growth. As a starting point, we adopted the models proposed by Araujo and Lima (2007) and Nell (2003). The paper also presents computer simulations to test how structural changes in the Pasinetti-Kaldor sense affect long-term economic growth. This approach is relevant insofar as it enables the identification of sectors and trading partners that contribute the most to long-term growth, as well as proposing economic and industrial policies that improve trade relations and economic competitiveness.