Yes, indirectly.
Flaxseeds don't inherently regulate hormones on their own, but they do provide a rich source of Omega-3 fatty acids.
Omega-3s help by:
> "Enabl[ing] the fats to create healthy, flexible and responsive cell membranes that accommodates cells in a rather more convenient and easy way. While such is the primary health benefit of fish oil, omega-3 fatty acids likewise help in the body by **ensuring that the cellular receptor sites are repaired, in good condition and will work in optimal force** anytime."
Having optimal cellular receptors, in turn, is necessary to regulate hormones.
Ergo, seeds provide the body with Omega-3s which in turn help repair and optimize cellular receptors which in turn keep hormones balanced.