This adaptive phase II/III randomized trial is designed to demonstrate that eradication of oligometastases by the new technique SBRT is a promising and emerging way to delay disease progression and to postpone second line systemic therapies. Only patients with an oligometastatic recurrence after local treatment with curative intent will be eligible to take part in this trial. All participating CRPC patients with oligometastases will receive either the standard of care (i.e. LHRH agonist in combination with the new generation of hormonal therapy [Enzalutamide]) or the experimental treatment (i.e. LHRH agonist in combination with the new generation of HT [Enzalutamide] plus the additional SBRT treatment). The patients will undergo different evaluations before treatment, such as imaging to confirm oligometastatic recurrence and blood tests. Patients will be stratified according to the location of metastasis (visceral [with or without bone metastases] vs. bone metastases alone) and PSA doubling time (≤ 3 vs. > 3 months). As per the standard of care, patients will have PSA testing performed every 6-12 weeks and re-imaging at 6, 9, 12, 18 and 24 months or at PSA progression, whichever occurs first.