I have find Solution..
PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(path + "/TablesSideBySide.pdf", FileMode.Create));
doc.Open();
PdfPTable table = new PdfPTable(3);
table.TotalWidth = 144f;
table.LockedWidth = true;
PdfPCell cell = new PdfPCell(new Phrase("This is table 1"));
cell.Colspan = 3;
cell.HorizontalAlignment = 1;
table.AddCell(cell);
table.AddCell("Col 1 Row 1");
table.AddCell("Col 2 Row 1");
table.AddCell("Col 3 Row 1");
table.AddCell("Col 1 Row 2");
table.AddCell("Col 2 Row 2");
table.AddCell("Col 3 Row 2");
table.WriteSelectedRows(0, -1, doc.Left, doc.Top, writer.DirectContent);
table = new PdfPTable(3);
table.TotalWidth = 144f;
table.LockedWidth = true;
cell = new PdfPCell(new Phrase("This is table 2"));
cell.Colspan = 3;
cell.HorizontalAlignment = 1;
table.AddCell(cell);
table.AddCell("Col 1 Row 1");
table.AddCell("Col 2 Row 1");
table.AddCell("Col 3 Row 1");
table.AddCell("Col 1 Row 2");
table.AddCell("Col 2 Row 2");
table.AddCell("Col 3 Row 2");
table.WriteSelectedRows(0, -1, doc.Left + 200, doc.Top, writer.DirectContent);