LnL Tactical is not single man but squad based like ASL.
I can't think of any "modern" games. Cityfight by SPI and Firepower by AH were both single man counters. Ambush series is the only WWII SMC games I can think of.
DVG Warfighter Series (Modern, WWII, WWII Pacific, Shadow Wars, PMC so far) is a good one but card based not hex and counter. Matters to some.