Sumava Resorts is an unincorporated community in Lake Township, Newton County, in the U.S. state of Indiana.Sumava Resorts was laid out in 1926. A post office has been in operation at the community since 1928.Sumava Resorts is located at 4109?59?N 8726?21?W? / ?41.16639N 87.43917W? / 41.16639; -87.