<p>This study developed a novel sand-consolidated anchorage prestressed (SCAP) bolt that incorporates a sand self-sealing rock-like seal to address limitations of conventional sand sealing methods. We thoroughly investigated the SCAP bolt’s mechanical behavior and sealing resistance through theoretical analysis and laboratory tension tests. The results revealed that: (1) the super-dense and dense sand zones served as the primary load-bearing regions, whereas the loose sand zone mainly resisted crushing of the sand column. (2) As the sand column transitioned from crushing to compaction, sealing resistance first decreased and then increased with rising tensioning force. (3) After loading and rigid seal removal, increasing the tensioning force raised the residual anchoring force. For the unsealed bolt, the residual anchoring force reached 109.9 kN at a tensioning force of 172.7 kN, which corresponded to 63% of the maximum anchoring force. (4) The seal bore most of the tensioning force during the initial tensioning stage. Consequently, the sealing resistance-to-tensioning force ratio was high. This ratio decreased progressively as the tensioning force increased. A sealing resistance of 6 kN was sufficient to tension the bolts to a target load of 170 kN. Tension tests results confirmed that the proposed sand self-sealing rock-like seal expanded the bolt’s effective anchorage range and increased its ultimate anchoring force, which provide an effective alternative to conventional rigid sealing technology.</p>