For the coils design of the inductive power transfer (IPT) system, the coils for the received-side and the transmitter-side are usually designed symmetrical in order to obtain better coupling coefficient and for simplicity. Along with a growing number of space-constrained devices, such as drones and small automated guided vehicles (AGV), much more flexible designs of receiver coil, such as asymmetrical coil designs are of great interest. Nevertheless, since power transfer efficiency of the IPT system is highly correlated with the parameters of coils, it is challenging to convert symmetrical coils into asymmetrical coils while maintaining the power transfer efficiency and the load independent output. This paper proposes a design methodology of converting symmetrical coils into asymmetrical coils for series-series inductive power transfer (SSIPT) that keeps similar transfer efficiency and maintain the load independent current (LIC) output. The analysis of coils' parameters including the size and transfer distance is also taken into consideration, and the asymmetrical coil design flowchart is also introduced in this paper. Finally, a 30W experimental platform of the SSIPT system is built, and the experimental results verify the theoretical analysis and the practical feasibility of the proposed asymmetrical coil design.