We theoretically investigate charge transport in a junction between a conventional superconductor and a ${\mathrm{V}}_2\mathrm{O}$-based altermagnet exhibiting distinctive spin-split quasi-one-dimensional Fermi surfaces. The altermagnet is described by a microscopically motivated seven-basis-state model with six-orbital characters that incorporates sublattice degrees of freedom associated with both V and O sites. Based on calculations performed under various boundary conditions, we demonstrate the robust emergence of specular Andreev reflection with a distinctive spin polarization. Furthermore, we propose an efficient multiterminal setup to detect this specular Andreev reflection through nonlocal conductance measurements. Our results establish ${\mathrm{V}}_2\mathrm{O}$-based altermagnets as a promising platform for realizing spin-resolved Cooper pair splitting, which is essential for generating energy-entangled electron pairs.

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• Altermagnetism
• Andreev reflection
• Transport phenomena
• Altermagnets
• Junctions
• Superconductors
• Transition metal oxides