You would need to create new controller that will return a redirection. To create a controller, you need to create class that inherits http.Controller and your redirection method should be decorated with @http.route

    @http.route(['/mypage'], type='http', auth="public", website=True)
    def redirect(self):
        return werkzeug.utils.redirect("/myNewPage",301)

You can see the blog module from odoo v8 for more examples on the use of redirection.