Yes. Brussels Sprouts and Sage have a documented companion-planting benefit. University of Minnesota Extension notes sage and thyme reduced diamondback moth populations on Brussels sprouts in greenhouse research.
This is a practical yes, not a magic guarantee. Keep the normal spacing for Brussels Sprouts and Sage, watch airflow and watering, and treat the companion note as one useful planning signal alongside sunlight, soil, and harvest timing.
Source basis: University of Minnesota Extension companion planting guide. The page does not add extra pest-control or yield claims beyond the sourced fact row.
Spacing tip: Use herbs and flowers as edge plantings so they help diversity without competing for the crop row.