This study aimed to validate a newly-developed instrument, The Writing Strategies for Self-Regulated Learning (SRL) Questionnaire, with respect to its multifaceted structure of SRL strategies in English as a foreign language (EFL) writing. A total of 790 undergraduate students from 6 universities in Northeast China volunteered to be participants. Confirmatory factor analyses (CFA) through structural equation modeling (SEM) were applied to evaluate 3 hypothesized models. The results of the CFA validated a 9-factor correlated model of second language (L2) writing strategies for SRL with satisfactory psychometric characteristics. Model comparisons confirmed a hierarchical, multidimensional structure of SRL as the best model, in which self-regulation, as a higher order construct, accounted for the correlations of the 9 lower-order writing strategies, pertaining to cognitive, metacognitive, social-behavioral, and motivational regulation aspects. Multiple regression analysis revealed that 6 out of 9 SRL strategies had significant predictive effects on EFL writing proficiency. The empirical evidence lends preliminary support to a transfer of SRL theory from educational psychology to the field of L2/EFL education, particularly L2/EFL writing. Implications of these findings are discussed.