The simple answer is: of course.
Sand is defined as a lose granular material with grains between 0.074 and 4.75 mm diameter (US definition) or 0.0625 to 0.2 mm (Wentworth, 1922, scale). There is also a logarithmic scale referred to as the Phi scale (Krumbein 1934). Basically grain sizes between approx. 0.05 to 2 mm are defined as sand. Anywhere where there is exposed sediment, some of the sediment will be in the sand fraction.
To obtain "pure" sand it is necessary that some sorting agent act on the sediment. This can be achieved by wind, flowing water (rivers) and wave action. These processes will to different degrees sort out certain grain sizes and provide accumulations of limited grain size distribution. All of the transport processes tend to sort material to some extent. Wind is most limiting, whereas flowing water and wave action is less so but in all cases the sorting depends on the energy provided to move the sediment.
Since Antarctica is largely covered by ice there are not large areas exposed to wave action, flowing river water or wind. But along the shore of the Antarctic peninsula there are many sediment beaches exposed to wind and wave action. In addition, the Dry Valleys area is a low precipitation area that has experienced dry desert conditions for maybe 2 Ma (Fountain et al 1999). In such areas there is ample opportunity for sorting processes to generate well sorted sediments and hence sands. Whether sands will accumulate in the form of dunes or be deposited in other landforms depend on the processes in the area and where sediments accumulate. Many beaches on the Antarctic peninsula are for example dominated by boulders because the smaller fractions are eroded away to more protected bays. This is common in all environments.
So sands are present in Antarctica for the same reasons as sands appear elsewhere on the Earth. Limitations come from the area exposed to sorting processes in Antarctica since much sediment is covered by glacier ice. We also need to remember that glacier ice is to a large extent responsible for creating smaller fractions of sediment due to crushing processes (Hooke and Iverson, 1998)
Fountain AG, Lyons WB, Burkins MB, Dana GL, Doran PT, Lewis KJ, McKnight DM, Moorhead DL, Parsons AN, Priscu JC, Wall DH, Wharton RA, Virginia RA, 1999. Physical Controls on the Taylor Valley Ecosystem, Antarctica. BioScience. 49 (12), 961–971. doi:10.2307/1313730.
Hooke, RLeB, Iverson, NR, 1995. Grain-size distribution in deforming subglacial tills: Role of grain fracture. Geology 23 (1), 57–60.
Krumbein WC, 1934. Size frequency distributions of sediments. Journal of Sedimentary Petrology. 2 (4), doi:10.1306/D4268EB9-2B26-11D7-8648000102C1865D.
Wentworth CK, 1922 A Scale of Grade and Class Terms for Clastic Sediments. The Journal of Geology, 30 (5), 377-392. doi:10.1086/622910