Lion Brewery Ceylon Ltd
Now one of the most pleasant surprises about any trip to Sri Lanka is that the local Lion beer is amazing. It has such a smooth full bodied flavour that you want to keep ordering another but you cant as they are all strong. It comes in three types. There are two blonde larger beers. One just called Lion Beer at 4.8% alcohol and then Strong Lion Beer at 8.8%. If you like Guinness or British style brown ales then you will love Lion Stout at 8.8%. The Sri Lankan Government place a high excise tax on beer so it is not as cheap as you would expect.
Source: MooreTravelTips Read a little about the history of beer there
So, yes they have beer in Sri Lanka