Abstarct: Steel sheet piles driven in harsh marine environments, in some cases are undergone high corrosion in such a way it’s not effective to repair them through coating them with retrofitting materials since due to high corrosion rates –commonly happens in splash/tidal zones- the connection between the rod and sheet pile gradually becomes disjointed. It endangers structural safety and causes big displacements in the overall soil- structure system. These displacements in turn cause failure in the soil behind sheet pile wall. In this condition –in which the sheet pile has lost one of its supports and its stiffness had been reduced significantly- application of convenient retrofitting methods for rehabilitation of structural sheet pile performance is not considered to be a suitable procedure. Generally in sheet pile structures, the main sheet pile wall is highly damaged while the anchorage sheet piles and rods are steel reusable. Driving new sheet piles, it is possible to exploit the advantage of anchorage system completely and main sheet pile wall relatively and therefore the economic considerations could be taken into account. New innovation aspect of this research is to consider the joint (simultaneous) behavior of existing and new sheet piles in bearing applied loads and also behavior of the soil behind wall. In this research, PLAXIS is used as modeling software. The primary models are created with a row of existing (corroded) sheet piles anchored with tie rods of different reduced cross sections in the location of connection due to corroding ambient. It gives the critical amount of corrosion in tie rod cross section. The next model is created with the previous existing sheet piles, tie rods of critical reduced cross section and a row of new (auxiliary) sheet piles –having two- thirds of cross sectional strength properties of the existing sheet piles. In this case it is examined if new sheet piling can limit displacements and stresses in existing soil- sheet pile system.