Production of semisolid metallic components starts with a slurry of suspended non-dendritic solid particles. Such slurries are commonly produced by applying shear stress to a solidifying melt or by encouraging copious nucleation during initial stages of solidification. As yet, all the employed methods use a two steps processing where in the first step the non-dendritic slurry is prepared in a container outside the die and then the slurry is cast into the die. Furthermore, higher viscosity of semisolid metallic slurries have practically made their gravity casting impossible and resulted in a need for some sort of mechanical force to push such viscous slurries into the die cavities. This necessitates the use of expensive high strength metallic dies. Therefore, only mass production of semisolid components has been economically justified so far. The main objective of this work was to develop a single step semisolid part production method and investigate the possibility of achieving non-dendritic microstructure in A356 alloy during sand casting without the need for any expensive metallic die or any special previous processing on the melt. For this purpose, in the first step, a sand mould with three different types of running systems was designed and its mold filling and solidification process were simulated using ProCAST simulation software. Second step involved casting of A356 alloy from fully liquid state in the three types of running systems under gravity and centrifugal casting conditions. The cast microstructures were then studied. In the third step, the alloy was centrifuge cast from semisolid state in the three types of running systems and microstructure and fluidity length of all the castings as well as hardness, porosity content and tensile properties of some of the castings were studied. Microstructural investigations in the second step showed that non-dendritic structures could be produced by using a chill fitted sand core in the sprue of the gating system and reducing the superheat temperature under centrifugal casting condition. Also casting under centrifugal rather than gravity condition and reducing the superheat temperature, reduced the grain size. Size of the primary particles and primary particle groupings as well as roundness of the primary particles increased with an increase in the solid fraction and roundness of primary particle groupings decreased with an increase in the solid fraction. With changing the running system design from first to third at a given solid fraction, size of primary particles decreased and their roundness increased. With investigation of fluidity length, it is shown fluidity length decreased in three running systems with increasing solid fraction. Casting under centrifugal condition, lower superheat temperature and using third running system, increased the hardness of the parts cast from fully liquid state. With an increase in the solid fraction, hardness of parts cast from semisolid state decreased. Mechanical properties of cast parts increased under centrifugal casting condition and lower superheat temperature. Keywords: Non-dendritic structure, Semi-solid alloys, Gravity casting, Centrifugal casting, A356 alloy