There are several synonyms that can be used for the term "self-destructive policy". One of these is "counterproductive policy", which refers to policies that actually prevent the achievement of their intended goals. Another synonym is "self-defeating policy", which suggests that the policy is actively working against its own interests. "Self-sabotaging policy" is another similar term, which implies that the policy is causing harm to itself. "Damaging policy" could also be used to describe a policy that is having negative effects on the entity that implemented it. Ultimately, any term that conveys the sense of a policy that is working against its own interests could be considered a synonym for "self-destructive policy".