This religion is much easier than you think. Sujud al-Sahw is prescribed to compensate for the mistakes occurring during salah. A person suffers from chronic forgetfulness has first to seek remedy to improve his concentration.
Second, when you are performing sujud al-Sahw, try to make it short, but with due concentration, in order to limit the chances of forgetting. However, if you forget whether you have made one sujud or two and there is no way to make sure, then all you have to do is to make another sujud deeming the one during which you forgot to be the first.