of course you can re seed it, dig it over really well removing any large stones and working the soil to a fine crumb texture, and firm down well levelling it as you go with the edge of a long plank
rake the surface and water well, sow grassseed of an appropriate type depending on shade/amount of use etc and keep off it not the best time to do this but if you keep the soil well watered and manage to keep the birds off youwill get a fair result,, covering the soil with polythene once you have sown the seed will help until the seed starts to grow.
Good luck, just be patient you may need to seed any bare patches later but by next spring you should be ok



