The wood supply chains encompass a multitude of agents with independent business processes and information systems. The network of interrelationships and information flows among the agents is often neglected when designing information systems. Common processes and automatic data exchanges can enhance collaboration as well as improve IT alignment with business needs across multiple organizations in the supply chain. This article proposes an Enterprise Architecture methodological approach for designing an integrated modular Wood Supply Management System. Both Process Architecture Framework and Information Architecture were developed and used to define individual systems and integration requirements, discussed on the Applications Architecture. The Technological Architecture was further addressed. Results of its application to the Portuguese pulpwood, biomass and lumber-based supply chains are presented. Results show that this approach can effectively specify individual systems requirements driven from the processes descriptions built in collaboration with the agents. It further shows that a Service-Oriented Architecture can be derived, ensuring systems integration and interoperability.