Business processes evolve dynamically with changing business demands. Because of these fast changes, traditional process improvement techniques have to be adapted and extended since they often require a high degree of manual work. To reduce this degree of manual work, the automated planning of process models is proposed. In this context, we present a novel approach for an automated construction of the control flow structure simple merge (XOR join). This ac-counts for a necessary step towards an automated planning of entire process models. Here we build upon a planning domain, which gives us a general and formal basis to apply our ap-proach independently from a specific process modeling language. To analyze the feasibility of our method, we mathematically evaluate the approach in terms of key properties like termina-tion and completeness. Moreover, we implement the approach in a process planning software and apply it to several real-world processes.