(17 April 1578 – 21 June 1656), known as Sandaus or Sandaeus, was a noted Dutch Jesuit theologian.
Van der Sandt was born in Amsterdam, then part of the Spanish Netherlands.
He entered the novitiate of the Society of Jesus, 21 November 1597; he taught philosophy at Würzburg and Sacred Scripture at Mainz.
He wrote many works on philosophy and theology, among others a notable controversial reply to the Batavian Calvinist Lawrence in defence of the moral teaching of the Jesuits, entitled Castigatio conscientiae Jesuiticae cauteriata.
He died at Cologne, then a free city in the Holy Roman Empire.