Indonesia’s defense modernization requires substantial and sustained financing, yet fiscal constraints limit the government’s capacity to fund large-scale major weapons systems (MWS) procurement through annual budget allocations alone. This study examines the opportunities, risks, and policy implications of foreign loan financing for defense modernization and the strengthening of national defense-industrial self-reliance. Using a qualitative literature-review approach, the study applies content analysis to academic publications, regulations, policy documents, official institutional data, and selected international experiences. The findings show that foreign loans can improve financing certainty for long-term defense acquisitions and create opportunities to support technology transfer, offsets, domestic content requirements (TKDN), and the development of national industrial capabilities. However, these benefits are accompanied by significant risks, including debt-sustainability pressures, exchange-rate exposure, long-term fiscal commitments, supplier dependence, and potential technological reliance on foreign partners. The analysis further indicates that the effectiveness of foreign financing depends on procurement design, bargaining capacity, institutional coordination, contractual enforcement, and domestic absorptive capacity. Accordingly, this study proposes an integrated policy framework built on four interrelated pillars: fiscal sustainability, institutional strengthening, optimization of TKDN and offset mechanisms, and comprehensive debt-risk management. Foreign loans should therefore be treated not merely as financing instruments, but as strategic defense-economic policy tools capable of simultaneously supporting military modernization and strengthening Indonesia’s defense-industrial independence. The evidence base combines peer-reviewed scholarship with official Indonesian budget, planning, regulatory, and procurement documents available through September 2026.