Three sterol sulfates were isolated from AMPK activity-guided fraction of a marine sponge Acanthodoryx fibrosa. Their structures were determined by an extensive NMR analysis, MS data, and two compounds were confirmed as unusual phosphorylated sterol sulfates by comparing with NMR data of the known compounds. Compound 3 was given to be a new dephosphated sterol sulfate derivative. Compound 1 moderately showed AMPK activation effect on L6 myoblast cell through Western blot analysis.