This article provides guidance on the approach of internal audits in the occupational safety and health management system in order to identify requirements not fully provided for in Decree 1072/2015. For this purpose, a Boyacá Business Group, made up of four cargo transport companies, is taken as the application scenario. A management model was created that integrates the variables involved in an audit process in accordance with ISO 19011 in order to provide evaluation tools that add value to their results while contributing to sustained productivity rates. Subsequently, Forrester’s simulation was applied, in which possible scenarios and the application of causal diagrams for the interrelationship between endogenous and exogenous variables are proposed.