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Just to chime in here on this long abandoned question, the code generation module that DSM mentions is now included in Sage. Here's a short example:

sage: x, y = var('x, y')
sage: f = x**2 + sin(y)/sqrt(5*x+9*y)
sage: fs = f._sympy_() # convert to a sympy symbolic expression
sage: [(c_name, c_code), (h_name, c_header)] = codegen(("f", fs), "C", "test")
sage: print c_code
/******************************************************************************
 *                      Code generated with sympy 0.7.1                       *
 *                                                                            *
 *              See http://www.sympy.org/ for more information.               *
 *                                                                            *
 *                       This file is part of 'project'                       *
 ******************************************************************************/
#include "test.h"
#include <math.h>

double f(double x, double y) {

   return pow(x, 2) + sin(y)/sqrt(5*x + 9*y);

}