To counter climate change and achieve sustainable agriculture goals, farmers must follow sustainable agriculture practices. Several factors have been described as influencing farmers' decisions to adopt sustainable agricultural practices, but adoption remains poor, especially in Africa. Based on the theory of planned behavior extended with constructs from the Norms Activation Theory, we investigate the adoption of sustainable agricultural practices by cocoa farmers in Côte d'Ivoire. The data was derived from a survey of 570 cocoa farmers conducted in 2020. We used structural equation model (SEM) to look for correlations between variables. The results indicate that subjective norm, personal norm, attitude, and perceived behavioral control are significantly positively correlated with farmers' Intention toward Sustainable Agricultural Practices and that farmers' personal ecological norm is affected both by the Awareness of the consequences of their action and their subjective norm when their attitude is only affected by Awareness of the consequences.