This study aimed to construct a causal relationship model of factors influencing communication arts students' qualification for sustainability communication (SC), examine the goodness-of-fit model with empirical data, and analyze the effect size of the causal relationship model in terms of influencing factors. Data were collected from 400 communication arts students using a set of questionnaires rated on a five-point scale. The results were analyzed using IBM SPSS Statistics 23.0 and LISREL version 8.80 to determine the causal relationship model. The findings revealed that the construct of the causal relationship model of factors influencing SC of these students comprised four latent variables measured from 12 observed variables. Moreover, the influencing factors were consistent with the empirical data at a good level considering the accordance index, which consisted of x2 = 13.153, df = 25, p-Value = 0.974, RMSEA = 0.000, Standardized RMR = 0.006, GFI = 0.996, and AGFI = 0.979. The causal relationship model of the factors affecting SC revealed that education sustainable development could have direct, indirect, and total effects; the knowledge-based journalist concept could have direct, indirect, and total effects; and communication art principles could have direct and total effects, respectively.